[anticensor]

Editing tweets is against the core concept of Twitter.

[celeritascelery]

I would consider “stories” against the core concept of twitter as well.

[chanmad29]

why not have a edit history but still show the most recent tweet at the time?

[dddbbb]

It doesn't mesh well with the retweet functionality if a user can retroactively change the content.

[taneq]

Then have the retweet keep the "version" of the tweet that they retweeted, maybe with a flag to say "this tweet has since been changed"?

[nradov]

That doesn't seem to be a problem on Facebook. Shared posts can still be edited later.