Here is a set of free socialize icons by dryicons.com. This set contains the most popular social-network icons and is placed inside a sticker, making these icons useful for all kinds of web projects. Although initially intended for blogger users, these icons can be modified to go beyond that for use in various website genres. Be sure to check out and bookmark dryicons.com.
Amount of icons: 12
Icon Sizes: 32x32px, 48x48px, 64x64px and 128x128px
File Types: .png
Color/Shape: Circle icons placed inside a sticker
Other Info: Universal icons