[mgeorgoulo]

All of these are already handled by facebook and such. Maybe involving something useful in the process would justify a new service.

For instance look at language exchange, which is penpals with an intent to learn each other's language. There might be other useful stuff a service could match people for.

[codingdave]

I'm not sure that Facebook already doing something is a valid reason not to do it in a new service. Quite the contrary, Facebook has validated the market for online connection, but is now struggling to find a way that to do it that is received positively by all. This could be a great time to slice off a piece of Facebook and make a new service.

[petecox]

Meetup - they have communities for lots of things. And its a paid service in the sense that an organizer may leave a tip jar on the table to cover costs.