It's the facebook version of r/mildlyinteresting on Reddit, which is also very popular. I think it's because this is the kind of thing that fills our days: small oddities and observations that spark our brain but aren't exceptional.
By virtue of the implied difference in demographics that's still a categorical change.
Personally I see the name as more a jokey play on the stereotype of boring middle aged men who find such things interesting.
#nailedit