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1.
An internet meme initiated or artificially exacerbated by irresponsible or otherwise unexpected attention from the mainstream media.

It is caused by the influence mainstream media has on digital culture due to the reach news sites and the like have to bloggers globally.
"That stupid slut is totally just a Media Meme"
"Susan Boyle would so not be famous if the media hadn't made a fuss over her"
by skinny wog May 22, 2009