Why do girls make a fish face in pictures?!

Ok, it drives me insane. One of my friends does that in all of her pictures but she does it WAY too much and looks like a fish. Even when people do a little pout its annoying and makes them look really stupid...

Maybe guys have different preferences but it annoys the crap out of me. Is there a reason that people do that? And is it attractive for some reason?

Please I can not understand this trend. And seeing all of these people do it in their Facebook pictures and stuff or after they finish trying to make a point. PLEASE EXPLAIN THIS!
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I'm not lesbian or anything. But I do have a thing about how I like when people smile. It just makes everyone look nicer. Girls and guys... any other input?

Why do girls make a fish face in pictures?!
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