The “Innocence of Muslims” video [or videos] was uploaded in June or July 2012 according to other timelines. Was mentioned in the Egyptian press a day or two before by one salafist cleric, IIRC. Received no real hits, though, until Benghazi.
There’s a couple of threads on FR about it. There’s articles on the web, this one is pretty thorough: http://canadafreepress.com/article/brennan-from-barack-to-benghazi