Competition is a good thing. It's confirmation there's actually a market there.

You're far better off with a small slice of a big pie than a big slice of a tiny pie.

Umm, So if someone has done something similar before - there is no reason to start?? Then I think pg can safely shut ALL YC companies and call it a day :) And call google and and ask them to shut down the company as yahoo was founded earlier. )))))