Both driver and rider logged onto the shared website. It was more like uberPOP, the intention was people registered drives they were planning to make anyway like regular commutes and then you got a kind of fuzzy geo-specific chatroom thing where you could see other riders who were interested in sharing line up. It also calculated the distance the first driver would have to go out of their way to pick you up and did some optimisation around that, and it calculated fuel costs. The idea was to let people split the fuel bills. Back then I was worried about peak oil.