I'm prompted to ask this question by a Facebook post by "US Uncut".

[Image lost to link rot.]

The Mexican media has blacking out the protests against their new government, who have been accused of doing everything from buying votes to buying off the media. If the corporate media won't spread this story, then let's spread the story. Share this all over your pages and your friend's pages and help support the democracy movement in Mexico.

It has a number of similarities to the fake image of Occupy Wall Street protests - improbably dense crowd, dodgy quality, and an indictment of the "corporate media" suppressing the truth. Also making me suspicious is how the same photo has popped up on a number of other websites, all without attribution, all with the same general message.