50 Vector Social Media Icons by Icon Dock

This free set includes 50 icons of the most popular social media networks on the internet.
Format: 32px and 16px in three different file formats: vector EPS, PNG, and GIF
License: Free for Commercial Use

100 Free BrightMix Icons by BrightMix, LLC Format: EPS Number of Icons: 100 License: None

1000 Free Farm-Fresh Web Icons from FatCow Format: PNG Size: 16 x 16, 32 x 32 License: Creative Commons