Roadsharing, getting there

I have long been thinking that Facebook probably would be a good platform for car/ride sharing similar to Mitfahrerzentrale, GoLoco or the failed Norwegian Haiketorget, and since we discussed it at work today, I had a cursory look if someone have already implemented the idea, and lo and behold:

• Road2Share: 1148 monthly active users, looks like the real deal but still too few users.
• Zimride | Carpool: 6549 monthly active users, good review, has launched its own homepage, so not sure if all users are counted, could be more. Also have a partnership with zipcar at Standford.
• Peugot EcoSharing: 39 monthly active users, and seemingly unusable at the moment.

The two first look promising, but what I’d really like is for bewelcome.org to provide this and integrate with facebook, twitter, buzz and not least provide apps for iPhone and Android with location awareness. That last point is probably the killer feature here.