I simply love Komodo Media social media icons but unfortunately they dont have Foursquare icon, which made me make one. Feel free to use it until they make original one :)
30 Fresh and Free Icon Sets for Designers and Developers -
Awesome collection (via ivanajurcic)
Awesome monster illustrations, can be used as icons too :) At least I would :D
monsters by nicotattoo
40 Minimalist Icon, Symbol & Pictogram Sets -
Shitload of free icons for your iPhone
A Huge Collection of Free Twitter Icons -
[experimental] pure CSS social media icons
I’ve already wrote about PixeloPhilia 2, but haven’t seen this first set before. Once again truly awesome iconset.
The Ultimate Free Web Designer’s Icon Set (750 icons, incl. PSD sources)
Baggy icon set, great one!