What makes a person so obsessed with other people?

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It's always been like this, but why? You have twitter, facebook or whatever there is and you see "celebrities" get millions of followers. Whatever the media shows, the people just swallow without even questioning it. I think it was yesterday when Yahoo blew up with the news for Kanye and Kim having a baby. And all I see is brain-washed chimpanzees who get so "exited" about it. It just got me curious what gratification or pleasure does a person draw from gossiping/knowing/being in another person's business? And yes, I do realise that celebrities don't really hide their personal life, but that's another topic. Some are obsessive fans and some are obsessive haters. It doesn't even have to a famous person. A person who never even dated someone (for example) ends up stalking the other but this whole thing makes zero sense to me.

BQ: Are you obsessed with someone? Do you tend to be interested in what is happening in other people's daily life?