Not another groupon clone please...
And I mean that literally. Once Google enters the game, who else will bother? Either
a) Google will lose against Groupon, proving that it's impossible to dislodge Groupon, or
b) Google will win against Groupon, in which case you'd be crazy to take on Google
David can sometimes beat Goliath, but if King Kong shows up to the fight as well then David should probably just go home.
c) Google launches, and some people use it... but not enough to make a dent in Groupon, but just enough people to justify running the service