Free Social Networking Icons Font
While stumbling through some font sites I went through dafont, where I found this amazing font called Social Networking Icons by Matt Grey. This social networking icons font is partial and free for personal use only. The complete set includes many more icons and additional useful icons for the web.
This free font is designed to cut out having to paste graphics around as well as simplify icons. You can embed this social networking icons font using tecnologies like @font-face and cufon. A recommended plugin for colouring them is LetteringJS. (A jQuery plugin for radical web typography).