As many new people with new ideas and points of view as possible. What other non-sex reason is there to hang out online all the time? :)
And, uh, yeah... if you're just a "friend whore" or trying to sell me something, save yourself the clicks and time and don't even bother. If I don't even kind of know you, you're not getting added. Make an effort... at least that way I'll know you're more than just some advertising gimmick or head case.