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Tweet Button

https://dev.twitter.com/docs/tweet-button
https://developers.google.com/+/web/+1button/ Documentation You can add and customize the +1 button to meet the needs of your website, such as modifying the button size and load technique. By adding the +1 button to your website, you allow your users to recommend your content to their circles and drive traffic to your site.

+1 Button - Google+ Platform

Like Button

https://developers.facebook.com/docs/reference/plugins/like/ The Like button is a simple plugin that will let people quickly share content with their friends on Facebook. When someone clicks on a Like button on a site, a connection is created in the Graph between the content and that person: an Open Graph Like action will be published, and stories will appear on that person's timeline and their friends' news feeds.