WebDesignerWall recently released a lovely set of vector social media icons! Always grateful when designers give away free graphics 
The full set includes 50 social media icons, which come in EPS, PNG and GIF file formats…pretty awesome I’d say! 
Download and Details
Hey hey, ArtWave Design icon creation anew! Web 2.0 Button Icons consists of 6 awesome web 2.0 icons: Twitter, Digg, Stumbleupon, Facebook, mixx and rss. They are free for personal use. Subscribe to our feed and stay tuned for all kinds of goodies from ArtWave Design 
Redistribution and Commercial use is NOT LEGALLY PERMITTED. […]
108 High Resolution Green Jelly social media icons PNG format. We all love to BE green
Free Social icon set shaped cloud. All most famous social network. 60×60 pixel. png files – These are lovely Download and Detials