(CNN) -- The stock photo, posted on a Facebook fan page for the accused Colorado shooter, shows two young men in a movie theater turning around to tell the people behind them to be quiet. "If you don't shut up," it says, "we'll James Holmes your a--." It's not new for Facebook pages to pop up in support of accused killers and other distasteful figures, but a few dozen Holmes fan pages -- including one with more than 800 followers that appeared the day Holmes is accused of opening fire on a theater in Aurora, Colorado, killing 12 people and wounding dozens -- are raising new questions about what constitutes free and appropriate speech in the digital age, especially on Facebook.
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Facebook pages backing the suspect in Colorado theater killings have popped up
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James Holmes is accused of killing 12 moviegoers early Friday morning
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A Facebook fan page for Holmes had more than 800 likes on Wednesday
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Professor of pop culture warns against reading too much into a tiny piece of the Internet
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The company has decided not to take down the @placeholder fan pages, although employees are monitoring them closely for types of speech that would violate the social network's community guidelines, spokesman Fred Wolens said.
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In the past, @placeholder has been criticized both for leaving up certain Facebook pages and images and for taking down others.