I buy "Rolling in the Deep" -- for a while you heard it absolutely everywhere. I think my vote would go to "Pumped Up Kicks," however.
I loved when Kathleen York performed Rolling in the Deep at the Oscars.
I thought "Party Rock Anthem" by LMFAO was slightly more ubiquitous than "Rolling In The Deep", although I'm sure it didn't have Adult Contemporary support.
Look, "Rolling In the Deep" is basically a lock for song/record of the year at the Grammys this year (and Adele is probably the frontrunner for album of the year, though you've also got Kanye, Taylor Swift, and Watch the Throne in the mix), but I think it peaked too early for "Song of the Summer" honors.
Ooh, I second "Pumped Up Kicks," though I do think "Last Friday Night" probably permeated the culture at more age groups. (As an aside, am I the only one vaguely horrified that Katy Perry is pretending to be like 14 in that video?)
Agree with Matt. Billboard says "Party Rock Anthem": http://www.billboard.com/news/lmfao-s-party-rock-anthem-named-billboard-1005343552.story#/news/lmfao-s-party-rock-anthem-named-billboard-1005343552.storyI say it's either that or Perry.
"Party Rock Anthem" and "Pumped Up Kicks" are going to suck me back into Summer 2011 when I hear them for the rest of my life. That said, I can't believe there are numbers to show anything other than "Rolling in the Deep" as the most successful song this summer. It was completely inescapable.