Well yeah but isn't that the entire internet?

If someone posts something online it likely gets archived by other services. They can edit the document but the original lives on.

With Steem if you edit a post and then query the content you will not see a history of edits. But if you stream the blocks and store the operations to a third party database you will always be able to get edit history.

Social media on a blockchain is definitely an interesting concept. Curious to see what happens with DMCA takedowns and legal claims in the future.