SpaceShare Green Travel -- carpool, community building
SpaceShare Green Travel builds ride- and room-share tools for festivals and conferences. Our sister effort Verdant Event builds complete websites for conferences with greening tools integrated.
Facebook relies on your facebook community. It might be useful for a student with lots of friends at the same campus, or in similar circumstances. Probably more useful as a social-carpooling tool: find a friend to a go to a festival with, and then decide which weekend and which festival. Without a big facebook community I can't even test it.
SpaceShare builds customized ridesharing sites for large events, often with other travel-sharing: coordinating room, flight and taxi connections. Of all the event carpool sites, they tend to cost the most and do the most hand-holding, customization and outreach assistance; often they have a community-building focus beyond travel sharing. SpaceShare focuses on conferences and festivals, with a mix of professional, music and activist events. SpaceShare is prototyping carpool systems for repeating "events." All their events are free for the carpooler to use: find upcoming public events here. They're also capable of building church, school or business systems, again integrated with forums or other community-building beyond plain carpooling.