My friend found out he is not guilty.

He found out? Didn't he know from the outset whether he was guilty? Or a court has found him not guilty?

To answer your question, Mugshots.com posts information on suspected criminals because that information is available and people find that information interesting.

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Originally Posted by lowfatman

my friend found out he is not guilty.

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Because being arrested doesn't assume guilt, only that a determination of guilt is forthcoming. Fact is they were still arrested.