Almost universally considered to be /a/'s most annoying meme, even more than "Set fail for One Piece" and "Why is she such a slut" by virtue of its massive popularity. Viral marketing enjoyed its highest rate of usage toward the end of December 2006 and the first months of 2007, whereby after that Anonymous diverted his attention to SaiGar and Haruhi topics in general became more rare. While still a popular meme, it has, along with the Haruhi anime, receded into the history books of /a/.
Incidentally, however, the meme was recently ressurected by Anonymous thanks to the new Gainax anime Tengen Toppa Gurren-Lagann. One day, an Anonymous posted a picture of a vaccuum-sealed Enki model on /a/, and another Anonymous responded, "is this viral marketing?", the joke being Enki's pilot is a character named Viral. As Viral himself became more popular on /a/, his name association with viral marketing became an excuse to hijack Haruhi topics with pictures of Viral. This further evolved to shopping Viral's face onto stock pictures of businessmen, busily worked up over sales figures and expenditure graphs. Much of this "re-imaging" of the meme has been viewed positively on /a/, partly because of Viral's fan following and because Gurren-Lagann has been a goldmind of humours (and well done) original content, a rarity on /a/ for any series.