Social Design Icons, Sneak Preview

My debut Dribbble shot is a preview of my social design icon set that I'm going to release on designmoo.com as soon as I'm finished with it (before 2011 hopefully). In addition to what you see here, there is also icons for LinkedIn and Vimeo. Any suggestions on what else to add are welcome. I'd like to get at least 20-25 different icons (different sites) finished before I release the set.