I lived in Germany from 2009 - 2010 and ridesharing is absolutely huge. I haven't heard of anything happening. I probably used the ridesharing website from 2 to 20x per month (didn't have a car but traveled a lot). This is the one I used: http://mfg24.spiegel.de (the "spiegel" part is actually a major German publication but the rideshare itself is powered by another company). I'm sure chrome will translate it for all you non-germans ;) It's been around for 10+ years