I'm sure this service would also be an awesome way to make friends. Everyone's a stranger before you get to know them. So maybe it's worth meeting up before getting into a cross-country car ride with them.
It would become known if anything like that happened methinks. Most likely it would be all over the news as a "Don't meet strangers from the internets! The internets are dangerous omg!"
It's an awesome service among friends though.
What's the service called in Slovenia?