Uber is currently the undisputed leader of the ride-sharing market, but that’s mainly because no major companies have really entered the market themselves, they’ve simply been pouring funding into Uber’s numerous competitors, which are all startups. If a company like Facebook or Google were to enter the market, however, Uber would have a significantly harder time maintaining its dominance, which is why a recently published patent application from Facebook should have Uber worried. According to the patent, Facebook is interested in creating a “carpooling” system that uses Nokia’s HERE mapping service, which sounds a hell of a lot like ride-sharing.