The Social Bookmark icons includes among others: Digg, del.icio.us, Design Float, Stumble Upon, Facebook, Reddit, Flickr, Twitter, Technorati, RSS.
Social Bookmark Icon Set - Social Media Icons
Number of Bookmarking Icons in Icon Set
26 icon set featuring 13 clean and 13 distressed popular online social networks and Web 2.0 sites
Suitable for Wordpress, Blogger, Drupal, Typepad, Joomla and other website applications
Free to use on personal or commercial blogs
Free Social Bookmark Icon Sets