Why does every "look at me" girl look like she's just taken a giant dump?

It doesn't matter what social media they're on, Instagram or GAG, every girl seems to have an expression that says "I've just squeezed out the biggest dump of my life, a three-flush wonder"

And is it just me or are they all starting to look the same too?

Thoughts?
Why does every "look at me" girl look like she's just taken a giant dump?
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