1 for blogging, 1 for social bookmarking, 1 for social networking, 1 for image sharing, 1 for micro blogging. What am I missing? - Mike Fruchter

Aggregation of the ones you mentioned: also, if you're including image sharing, there's video sharing and music sharing (and possibly even book sharing). - Mark Trapp

another one for lifestreaming? - Marcello Del Bono

Can I get these at the Post Office? - Jason Carreira

Thanks Mark & Jason. Video sharing and life steaming definitely belong on the list. - Mike Fruchter

don't forget social collaboration - wikis or google docs for collaborating on information, digg or reddit for interest collaboration. What about an aggregator for my aggregators? - Tim Hoeck