[putasidemobile]

> Facebook users can invite non-Facebook users by email to events, if they want to.

This stops after a while. Even when you stay a pleasant person, you'll always be "that guy" requiring an extra action to contact. The social ripple/ping of an event stays inside Facebook.

> You want to be in their social graph, but not have a Facebook account.

In the ideal form this would be a totally open protocol (with backing of Facebook, Google, ... and W3C).

In the current form, I do not know enough about Facebook to suggest a good system. Yes. I want to be in their social graph, but not have a Facebook account or be under Facebook TOS. If that is meaningless at the moment, maybe we should make it mean something.