Hey, well Steepshot works about the same as instagram except you can't upload gifs there and your upvotes are actually worth something. The platform itself, that every app I just listed is built on is called Steem blockchain and it's pretty complicated thing for newcomer but in short:
Steem enables social media with value transfer embedded. There's no ads and your posts can't be deleted from the blockchain. So no censorship at all, no one can silence you.
There are many posts that go in depth about Steem, I think teamsteem has good introductory series, you should check him out to learn more.