I don't think anyone I've ever played with even knows about enworld. There're a few on the boards I think would be cool to game with but far more I would definitely not want to play with when I consider past threads that have talked about play style and how they run games.
I’ve gamed pretty extensively with folks I only know through ENWorld. A couple of them have since stopped posting here, but we’ve played a lot together and I hope to do so again. There are also some other folks from here who have taken part in games with that group who I’ve not yet gamed with, but who I hope to.
Not that I'm aware of. We have a local convention in New England next month and several members go, but its not like we wear t-shirts with our name and avatar on them.
Even then, the ones that I know about are only because they were people with a notable presence. It's not like I ask people at the start of the game for their social media info.