Grindr was founded six years ago with just a few thousands bucks by Joel Simkhai, the same mane who founded Blendr a couple of years later. Apparently organizing hookups for gay men is good business, as Grindr has managed to survive all this time without a penny from investors, but Simkhai is done with independence and is apparently looking for someone to buy out the app, which has more than five million users at the moment.