Кнопка сочетающая в себе четыре кнопки для возможности поделиться веб-страницей с пользователями социальных сетей. В качестве иконок используется шрифт FontAwesome. Останется лишь прикрутить линки на сами сервисы.

HTML разметка

Ниже приведен код всех вариантов кнопок показанных в демке:

<div class="cell ">
    <div class="share-wrapper left">
      <div class="rc10 share-action icon-share"></div>
      <div class="share-container rc10">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper top">
      <div class="rc10 share-action icon-share"></div>
      <div class="share-container rc10">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell">
    <div class="share-wrapper below">
      <div class="rc10 share-action icon-share"></div>
      <div class="share-container rc10 ">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper bottom">
      <div class="rc10 share-action icon-share"></div>
      <div class="share-container rc10">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper right">
      <div class="rc10 share-action icon-share"></div>
      <div class="share-container rc10">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
 
<div class="cell ">
    <div class="share-wrapper left">
      <div class="share-action icon-share"></div>
      <div class="share-container">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper top">
      <div class="share-action icon-share"></div>
      <div class="share-container">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper below">
      <div class="share-action icon-share"></div>
      <div class="share-container">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper bottom">
      <div class="share-action icon-share"></div>
      <div class="share-container">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper right">
      <div class="share-action icon-share"></div>
      <div class="share-container">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper left">
      <div class="rc50 share-action icon-share"></div>
      <div class="share-container rc50">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper top">
      <div class="rc50 share-action icon-share"></div>
      <div class="share-container rc50">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
 
<div class="cell">
    <div class="share-wrapper below">
      <div class="rc50 share-action icon-share"></div>
      <div class="share-container rc50">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
<div class="cell ">
    <div class="share-wrapper bottom">
      <div class="rc50 share-action icon-share"></div>
      <div class="share-container rc50">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>
 
<div class="cell ">
    <div class="share-wrapper right">
      <div class="rc50 share-action icon-share"></div>
      <div class="share-container rc50">
        <a class="share-btn tl icon-google-plus" href='#'></a>   
        <a class="share-btn tr icon-twitter" href='#'></a>   
        <a class="share-btn br icon-facebook" href='#'></a>   
        <a class="share-btn bl icon-pinterest" href='#'></a>   
      </div>
    </div>
</div>

CSS

Кнопки и их position:

.share-wrapper,
.share-action {
  width: 32px;
  height: 32px;
}
.share-wrapper {
  font: 14px, 'FontAwesome';
  position: relative;
  text-align: center;
}
.share-container {
  margin-left: 0px;
  margin-top:  0px;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(.05,.93,.61,1.6);
  box-shadow: 0px 0px 20px -5px rgba(0, 0, 0, 0.5);
  width: 0px;
  height: 0px;
  background: #fff;
}
.share-action:hover ~ .share-container,
.share-container:hover {
  width: 100px;
  height: 100px;
 
  overflow: visible;
}
.share-container:after,
.share-container:before {
  position: absolute;
  background:  linear-gradient(rgba(136, 221, 255, 0.5) 0%, rgba(34, 153, 221, 0.5) 50%, rgba(136, 221, 255, 0.5) 100%);
  z-index:4;
  margin: 0;
  transition: all 0.5s ease-in-out;
  content: '';
}
.share-container:before {
  background:  linear-gradient(left, rgba(136, 221, 255, 0.5) 0%, rgba(34, 153, 221, 0.5) 50%, rgba(136, 221, 255, 0.5) 100%);
  height: 1px;
  margin: 50% 50%;
  width: 0%;
}
.share-action:hover ~ .share-container:before,
.share-container:hover:before {
  width: 85%;
  left: 0px;
  margin: 50% 7%;
}
.share-container:after {
  left: -1px;
  height: 0%;
  width: 1px;
  margin: 50% 50%;
}
.share-action:hover ~ .share-container:after,
.share-container:hover:after {
  height: 85%;
  margin: 7% 50%;
}
.share-action {
  display: inline-block;
  vertical-align: middle;
  z-index: 5;
  position: relative;
  background: linear-gradient(#8df 0%, #29d 100%);
  box-shadow: 0 1px 5px rgba(255, 255, 255, 0.5) inset, 0 0 0px 1px rgba(33, 112, 178, 0.5);
  line-height: 33px;
  color: #fff;
}
.share-btn {
  display:inline-block;
  width: 49%;
  height: 49%;
  position: absolute;
  z-indez:1;
  border-color: #92888f;
  border-style: solid;
  border-width: 0;
  font-size: 0px;
  color: #777777;
  overflow: hidden;
}
.share-action:hover ~ .share-container .share-btn ,
.share-container:hover .share-btn  {
  overflow: visible;
  font-size: 25px;
}
.share-btn:hover {
  background:linear-gradient(#8df 0%, #29d 100%);
  color: #ffffff;
  text-shadow: 0 -1px #4298e0;
}
.share-btn.tl {
  right: 50%;
  bottom: 50%;
}
.share-btn.tr {
  left: 50%;
  bottom: 50%;
}
.share-btn.br {
  left: 50%;
  top: 50%;
}
.share-btn.bl {
  right: 50%;
  top: 50%;
}
.share-btn {
  line-height: 50px;
}
.rc50 {
  border-radius: 50%;
}
.rc50 .share-btn.tl {
  border-top-left-radius: 100%;
}
.rc50 .share-btn.tr {
  border-top-right-radius: 100%;
}
.rc50 .share-btn.br {
  border-bottom-right-radius: 100%;
}
.rc50 .share-btn.bl {
  border-bottom-left-radius: 100%;
}
.rc50.share-container .share-btn.tl {
  text-indent: 5px;
  line-height: 55px;
}
.rc50.share-container .share-btn.tr {
  line-height: 50px;
}
.rc50.share-container .share-btn.br {
  line-height: 46px;
  text-indent: -2px;
}
.rc50.share-container .share-btn.bl {
  text-indent: 2px;
  line-height: 47px;
}
.rc10 {
  border-radius: 10%;
}
.below .share-btn.tl,
.rc10 .share-btn.tl {
  line-height: 50px;
}
.below .share-btn.tr,
.rc10 .share-btn.tr {
  line-height: 45px;
  text-indent: 3px;
}
.below .share-btn.br,
.rc10 .share-btn.br {
  line-height: 50px;
}
.below .share-btn.bl,
.rc10 .share-btn.bl {
  text-indent: -2px;
  line-height: 55px;
}
.rc10 .share-btn.tl {
  border-top-left-radius: 20%;
}
.rc10 .share-btn.tr {
  border-top-right-radius: 20%;
}
.rc10 .share-btn.br {
  border-bottom-right-radius: 20%;
}
.rc10 .share-btn.bl {
  border-bottom-left-radius: 20%;
}
 
/** positions **/
 
.below.share-wrapper {
  margin: 50% auto;
  top: -16px;
}
.bottom.share-wrapper {
  margin: 25% auto 0;
}
.top.share-wrapper {
  margin: 65% auto 0;
}
.left.share-wrapper {
  margin: 50% 0 0 65%;
  top: -16px;
}
.right.share-wrapper {
  margin: 50% 0 0 25%;
  top: -16px;
}
.below .share-container {
  position: absolute;
  top: 50%;
  left: 50%;
}
.bottom .share-container,
.top .share-container {
  position: absolute;
  top: 0%;
  left: 0%;
}
.left .share-container,
.right .share-container {
  position: absolute;
  top: 0%;
  right: 50%;
}
.bottom .share-action:hover ~ .share-container .share-btn:nth-child(1):after,
.bottom .share-container:hover .share-btn:nth-child(1):after {
  content: '';
  border: 11px solid transparent;
  border-bottom-color: #fff;
  border-top: none;
  width: 0;
  height: 0;
  position: absolute;
  left: 100%;
  margin-left: -11px;
  margin-top: -11px;
}
.top .share-action:hover ~ .share-container .share-btn:nth-child(4):after,
.top .share-container:hover .share-btn:nth-child(4):after {
  content: '';
  border: 11px solid transparent;
  border-top-color: #fff;
  border-bottom: none;
  width: 0;
  height: 0;
  position: absolute;
  left: 100%;
  top: 100%;
  margin-left: -11px;
}
.left .share-action:hover ~ .share-container .share-btn:nth-child(2):after,
.left .share-container:hover .share-btn:nth-child(2):after {
  content: '';
  border: 11px solid transparent;
  border-left-color: #fff;
  border-right: none;
  width: 0;
  height: 0;
  position: absolute;
  left: 100%;
  top: 100%;
  margin-top: -11px;
}
.right .share-action:hover ~ .share-container .share-btn:nth-child(1):after,
.right .share-container:hover .share-btn:nth-child(1):after {
  content: '';
  border: 11px solid transparent;
  border-right-color: #fff;
  border-left: none;
  width: 0;
  height: 0;
  position: absolute;
  right: 100%;
  top: 100%;
  margin-top: -11px;
}
.left .share-action:hover:after,
.right .share-action:hover:after,
.bottom .share-action:hover:after,
.top .share-action:hover:after {
  position: absolute;
  content: '';
  z-index: 1; 
}
.bottom .share-action:hover:after,
.top .share-action:hover:after {
  width: 200%;
  height: 20px;
  left: -50%;
  top: 100%;
}
.top .share-action:hover:after {
  top: auto;
  bottom: 100%;
  left: -50%;   
}
.left .share-action:hover:after {
  left: auto;
  width: 20px;
  height: 200%; 
  top: -50%;
  right: 100%;
}
.right .share-action:hover:after {
  top: -50%;
  left: 100%;
  width: 20px;
  height: 200%; 
}
.below .share-container,
.top .share-container,
.right .share-container,
.bottom .share-container {
  top : 0%;
  left: 50%;
}
.left .share-container {
  top : 0%;
  right: 50%;
}
.below .share-action:hover ~ .share-container,
.below .share-container:hover {
  top: -100%;
  left: -100%;
}
.bottom .share-action:hover ~ .share-container,
.bottom .share-container:hover {
  margin-left: 0px;
  left: -100%;
  top: 50px;
}
.top .share-action:hover ~ .share-container,
.top .share-container:hover {
  margin-left: 0px;
  left: -100%;
  top: -120px;
}
.left .share-action:hover ~ .share-container,
.left .share-container:hover {
  margin-right: 20px;
  right: 100%;
  top: -100%;
}
.right .share-action:hover ~ .share-container,
.right .share-container:hover {
  margin-left: 20px;
  left: 100%;
  top: -100%;
}
.bottom .rc10 .share-btn {
  text-indent: 0;
  line-height: 50px;  
}
.bottom .share-container .share-btn.tl {
  line-height: 55px;  
}

Стили отвечающие за изображения иконок:

@font-face{
    font-family:FontAwesome;
    src:url(http://netdna.bootstrapcdn.com/font-awesome/2.0/font//fontawesome-webfont.eot?#iefix) format('eot'),
    url(http://netdna.bootstrapcdn.com/font-awesome/2.0/font//fontawesome-webfont.woff) format('woff'),
    url(http://netdna.bootstrapcdn.com/font-awesome/2.0/font//fontawesome-webfont.ttf) format('truetype'),
    url(http://netdna.bootstrapcdn.com/font-awesome/2.0/font//fontawesome-webfont.svg#FontAwesome) format('svg');
    font-weight:400;font-style:normal;}
/*  Font Awesome styles
    ------------------------------------------------------- */
[class^="icon-"]:before, [class*=" icon-"]:before {
  font-family: FontAwesome;
  font-weight: normal;
  font-style: normal;
  display: inline-block;
  text-decoration: inherit;
}
a [class^="icon-"], a [class*=" icon-"] {
  display: inline-block;
  text-decoration: inherit;
}
/* makes the font 33% larger relative to the icon container */
.icon-large:before {
  vertical-align: top;
  font-size: 1.3333333333333333em;
}
.btn [class^="icon-"], .btn [class*=" icon-"] {
  /* keeps button heights with and without icons the same */
 
  line-height: .9em;
}
li [class^="icon-"], li [class*=" icon-"] {
  display: inline-block;
  width: 1.25em;
  text-align: center;
}
li .icon-large[class^="icon-"], li .icon-large[class*=" icon-"] {
  /* 1.5 increased font size for icon-large * 1.25 width */
  width: 1.875em;
}
li[class^="icon-"], li[class*=" icon-"] {
  margin-left: 0;
  list-style-type: none;
}
li[class^="icon-"]:before, li[class*=" icon-"]:before {
  text-indent: -2em;
  text-align: center;
}
li[class^="icon-"].icon-large:before, li[class*=" icon-"].icon-large:before {
  text-indent: -1.3333333333333333em;
}
/*  Font Awesome uses the Unicode Private Use Area (PUA) to ensure screen
    readers do not read off random characters that represent icons */
.icon-facebook:before             { content: "\f09a"; }
.icon-twitter:before              { content: "\f099"; }
.icon-pinterest:before            { content: "\f0d2"; }
.icon-google-plus:before          { content: "\f0d5"; }
.icon-share:before                { content: "\f045"; }

javascript не используется, но в данной демке применен плагин prefixfree, который позволяет не писать CSS3 префиксы в файле стилей. Префиксы допишет подключенный js файл.

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