Facebook already has similar edit functionality and I’m curious how many users click through to see the edits. I’ll be the number is not high.

The speed Twitter moves I think a lot more people are going to mash the retweet button than the “see edits” button.

Facebooks edit history is also hidden in grey text next to the timestamp. I bet putting a "This tweet has been edited" notice actually inline with the content would be effective.

Exactly my thought.

Also will all the retweets be edited as well or do you retweet a snapshot?

One place I used to frequent solved this by disallowing editing of the original content but allowing the author to add a small annotation after the fact. Doesn't really fix the "correcting typos directly" issue but does allow for clarifications, etc., without the possibility of changing the original meaning that people may have RT/QT/etc.

(You could also extend this to allowing the annotation to be added to a run of text and shove it in the entities object for extra clarity / highlighting.)

Having a time where it's not actually posted would work fine but probably not be super effective: after all, you already have an unlimited amount of time to look at the message sitting on your screen before you actually send it. It's just often very hard to read your own writing for typos. Still it would be a step forward. You could even make it opt-in.

Haha, I swear every time I wish I could edit a tweet it's within 5 minutes after I post it. To be fair, at least with my incredibly limited followers, that's soon enough I can just delete it and post it again without losing too much engagement, but still. I'm just not patient enough to proof-read properly, apparently.

How about a preview then?

No one would actually look at that though. You need to cater to the masses or make it exceedingly obvious

It would make it easy to call out anything nefarious, though.