Mobile social network startup Rummble launched a Facebook application today. People still can’t sign up direct from the main site as it remains in closed beta, but by adding the FaceBook application they can. Beta testers can signup when they load the app. This allows them to share their favourite places with friends. The mobile site is at http://m.rummble.com. Why is Rummble doing is this way? Founder Andrew Scott tell me “we’re opening up in a controlled manner”. I’m not sure if that means they don’t have enough server grunt yet or not, but it might be worth checking out. Here’s my previous review of Rummble.