for success, you're probably going to need social hooks, and facebook apps is a good way. the code feature could work to solve the issue, yes. or you could ju

for success, you're probably going to need social hooks, and facebook apps is a good way. the code feature could work to solve the issue, yes. or you could just allow drivers to administer how public their rides are, only allowing people to join if they are directly given the link to their ride or whatever.