To other developers (Rails, anyone?):
Want to create a similar/better/different version (I've got the points of differentiation written up) get in touch. Up to 50% of the equity is on the table (subject to terms, conditions, etc.), plus I seed fund (no salaries until proper milestone and subject to terms, conditions, etc.).
Before you scream "copycat," consider that this project has been on my backlog since before RideJoy existed or registered its domain name. The brands I've got for this include part of my "P2P" line, plus a "_ _ _str" name, both registered prior to RideJoy: p2pRides.com and Ridestr.com.
Why don't I do it myself? Because I can't (yet?). I'm a former venture finance guy who moved to Europe and tried to get some things going, including Airbnb before Airbnb was Airbnb. Google for "BuzzPal Revealing Its Product - ArcticStartup" for the video, which kind of sucks, but is what it is. It was also a bad name for the project, but I didn't yet own p2pRooms.com or any of other better ones for that project yet (do no and it's still on the backlog).
Why did I say "yet" in the paragraph above? Because I am now studying Software Engineering with an emphasis on what I need to learn to launch these kinds of projects myself and/or assess and analyze technical partners, co-founders, etc.
To RideJoy or Airbnb or others who have been and are making offers to acquire domain names: Deals are possible, but probably something with upside vs. straight cash deals like the one I did last year (related to Amazon's $500-million acquisition of Diapers.com).