There's a bunch of those services in Germany, too. Then again, I think car sharing has been a bit popular in Europe in general, as cars per capita might be a bit lower, gas prices are higher and not everybody has a car suited for longer routes.

(Established players in Germany: http://www.mitfahrzentrale.de/, http://www.mfz.de, http://www.mifaz.de/, http://mitfahrclub.adac.de/, http://www.mitfahrgelegenheit.de/; One new startup I'm aware of: https://www.flinc.org/?l=en)