That was short-lived.
Presumably Groupon, who went in my experience from "who the fuck are they?" to "as advertised on every bloody page I browse to" as soon as this buyout story started doing the rounds, will now go back to anonymity.
Just sometimes there are things that crop up that make me glad I don't have adblock. It was very interesting to see firsthand the sudden and not entirely unexpected ubiquity of Groupon which I would have been blissfully unaware of, had I that addon installed.
It must have been hard for Groupon to turn this one down with that: "But look where you could be seen....." dangled in front of them. Not that this was dangled at all of course, I'm sure that there's a perfectly reasonable and entirely less evil explanation that doesn't involve Google gaming their own ad system to suit themselves here.