Tired of Friendster and Orkut? Try Introvertster:
Introvertster is an online community that prevents stupid people and friends from harrassing you online.
Avoid invites to chat, filter out annoying invitations for Meetup, birthday parties, or after-hours get togethers.
Packet flood a friends Internet connection making it impossible for them to send you an instant message.
Help your friends get a clue that you really don't like people or care for idle chit-chat.