Get the most from your post. Major social media networks have made billionaires of their founders thanks to the free content their users generate. But fledgling Steemit actually pays users in digital currency called Steem, which they can trade for real cash. And 18 months after its launch, Steem’s the 21st most valuable cryptocurrency, with market capitalization flirting with $300 million. As enticing as the allure of earning income for curating puppy videos may sound, there’s a risk that Steem’s value will crash, leaving users with less tangible, Facebook-style rewards.