Twitter Now Encourages You To Revise Replies Before Tweeting

Twitter is running a limited test on iOS that asks users to think again and edit a reply that might contain harmful language, before tweeting it.
If you tend to regret many of the things you say or write when you’re angry, then you will already know that it’s probably a good idea to take a step back and rethink things before writing something that can come back and harm you. To help you do this, Twitter is testing a new feature that gives you a second chance before posting a reply.
The new feature is part of Twitter’s efforts to bring down the amount of harassment on its platform and is probably the closest you’ll get to an edit button – or a second chance before severely harming a relationship or offending people. If you can’t be trusted to say anything civil when angry, this might be just the feature you’ve been waiting for.
It doesn’t work if you hit reply straight away, though. You will get a prompt to rethink your “harmful” language beforehand; all you have to do is edit your reply before sending it.
Wersm.com