Steemit, Inc. is a privately held company based in New York City. So behind this blockchain platform is a private company, not a random group of developers as is often the case. Compared to some of its blockchain bretheren, Steemit is relatively simple.
Steemit.com is only one platform for blogs and social media content that sits atop the Steem blockchain.
The entire Steem system is built on secure blockchain software that runs on a network of computers. At the root of the platform is the currency STEEM, which is your typical transferrable, fungible, freely moveable token (similar to bitcoin).