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Besides technical reaosns, it could be to avoid bait-and-switch schemes, where a lot of engagement is built around one headline, and then it's changed to something with a completely different meaning.

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I've always thought that Twitter adopted the same line of thinking, preventing tweets from being editable.

I think it twitter's case it was architectural. By treating tweets as immutable the could publish them on a pipeline and not worry about duplicate copies around the system being out of sync.

That and early on it used sms as one of the interfaces, which is not editable.

They could always send another SMS with the edit. :)

But yes, that too. The whole system was designed around SMS which couldn't be "unsent".

It's to prevent tweeting "LIKE this if you like Ice Cream" and then editing it to say "LIKE this if you like pedophilia"

Nobody would ever Like/Retweet anything if it could be changed later.

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