Decentralization, a crypto-currency reward system, and transparency! These are three very critical differences that set Steemit apart from the other social networking sites like Facebook, Reddit, and so on.
This site is going to help people not only be able to post their content without the chance of censorship like Facebook and other sites have been employing, but it will also introduce many individuals to crypto-currency.
Facebook makes billions of dollars from the advertisements that get displayed thanks to the content that it's users have made over the years and continue to make daily. But those users don't benefit at all; not in the same way that they can benefit directly from posting their material on a site like steemit.
I think it's only a matter of time before many many more people find out about and gravitate toward this site! And I am looking forward to seeing it grow.