Simple Icons is a set of 96 free social icons that cover almost all of the well-known social services (Twitter, Facebook, Instagram, Google+ and much more).
All the items are placed on a different background color that matches the related brand and all looking slick.
Icons come in 11 different sizes from 16*16px to 4096 to 4096px and in .PNG format and free to use in commercial projects.
Website: http://simpleicons.org/
