I started seriously thinking "bubble", when someone I know who runs a moderately-successful, very small Groupon clone, decided to launch an incubator. Maybe th

I started seriously thinking "bubble", when someone I know who runs a moderately-successful, very small Groupon clone, decided to launch an incubator. Maybe that's not the sign of a bubble though. Maybe it will be a bubble when someone launches an incubator for incubators.