It's because our brains are wired to remember ridiculous images, not actual facts. It's like our minds are saying, "Hey, let's remember this cat playing the piano on the moon! Yeah, that's a thing that'll stick."
Hyperlinks to related subpages: Memes Are Like Diseases, Don't Get Your Nose Tattooed
It's because humans are fascinated by the concept of 'reality' that's been heavily edited for drama and ratings. It's like watching a trainwreck in slow motion, but with more product placement.
Hyperlinks to related subpages: Why Did We Make It to the Top 10, It's Not Like Reality
It's because our brains are still trying to figure out what the point of human connection is, and selfies are just a fancy way of saying "I'm here, I'm here, look at me!."
Hyperlinks to related subpages: Selfies Are Like Dog Tags, Why Selfies Matter
Hyperlinks to other sections: What Doesn't Exist, Why Does it Matter