//linked in like button
http://developer.linkedin.com/plugins/share-button
http://developer.linkedin.com/plugins/share-button
//twitter tweet button
https://twitter.com/about/resources/buttons#tweet
https://dev.twitter.com/docs/tweet-button
//facebook like button
http://developers.facebook.com/docs/reference/plugins/like/
//google +1 button
http://www.google.com/intl/en/webmasters/+1/button/index.html
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