I knew about Steemit from a twitter post, I don't remember who shared it. I'm always curious about new social media and projects I see around, so I created my account and wrote some posts. I didn't expect anything about money honestly. I was lucky, because I immediatly found some amazing users not posting just about cryptostuff and tech. And I was lucky also because @blocktrades started upvoting me often.
When I saw rewards actually coming, I thought "Hey! I cant believe it!"; and "It can't last for sure." ;)