Real Time Ride Share Website

I want to go to SEATAC at 4am and I live in North Seattle. I want to join up with other fliers in the vicinity and leverage those 5 people by telling Shuttle Express that they can meet us all at one location or that we're all in the same area going at the same time. We then negotiate a lower price for helping them consolidate their Shuttling and we save money, time and gas/carbon/planet with targeted carpooling. Could be leveraged in other ways as well: Crowd-sourcing taxi cab rides from bars with cellphones. I should be able to make instant friends by sharing a cab with random people leaving an area at the same time if we're all going in the same general area of town. This idea counts as two, boo hoo!