From my findings I made a collection of the social networking icons and have put them up for a free download. Each has at from 3-6 different sizes including 16px, 24px, and 32px. The list of the icons included in this free download are below.
|Free social networking icons|
Add This, Amazon, AOL, App Store, Apple, Bebo, Behance, Bing, Blank Color Buttons, Blip, Blogger, Bright Kite, Coroflot, Daytum, Delicious, Design Bump, Design Float, Deviant Art, Digg, Dopplr, Dribble, drupal, Ebay, Email, Ember, Evernote, Facebook, Feedburner, Flickr, Forrst, Foursquare, Friendfeed, Friendster, Gdgt, Git Hub, Google, Google Buzz, Google Talk, Google+ 1 Files, Google+ 2 Files, Gowalla, Heart, Hyves, Icon Dock, ICQ, Identi, Instagram, iTunes, Last FM, Linked In, Meet Up, Metacafe, Microsoft, Mister Wong, Mixx, Mobile Me, MSN, MySpace, NetVibes, Newsvine, PayPal, Photo Bucket, Picasa, Pinterest, Podcast, Posterous, Qik, Reddit, Retweet, RSS, Scribd, Share This, Skype, Slash Dot, Slide Share, Smug Mug, Sound Cloud, Spotify, Squidoo, Star, Stumble Upon, Technorati, Tumblr, Twitter, Viddler, Vimeo, Virb, w3, Wikepedia, Wordpress, Xing, Yahoo, Yahoo Buzz, Yelp, and YouTube.