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I'm assuming that at first glance the "Trending" front page was meant to be a draw for new users. They would see the high dollar posts and think, "Wow! That could have been me!" The funny thing about social media is plenty of things go viral without a monetary incentive. Some people actually do engage with social media for the enjoyment factor.

Facebook has close to 1 billion active accounts and doesn't pay their users a dime. It filled a need in a space where there was a want. No one signed up to strike it rich on Reddit, Facebook, or YouTube, and yet some people's claim to fame came from just those very places.