Marc Andreesons latest startup came out of the laundry today (prior it was called 24h laundry) - so welcome Ning to the world.

We've built an online service (or Playground, as we like to call it) for building and using social applications. Social "apps" are web applications that enable people to match, transact, and communicate with other people.

Should be very interesting to see what gets built on this "playground." It also seems like a good place for XRI/XDI and perhaps also reputation for the different participating folks.