That'd mean for each and every post, memo would have to search for possible revisions, it might not be feasible.
I was thinking on memo. If a user modifies a post, it is stored as a new post, and when the page asks for a particular post, the newer postis delivered somehow. \1
It can be done without a doubt. But the old words will still be there, they are permanent. People can easily check the blockchain to read your old memos.
