They were directly competing until recently: https://help.twitter.com/en/using-twitter/revue https://help.twitter.com/en/using-twitter/revue Twitter Blue allow

They were directly competing until recently: https://help.twitter.com/en/using-twitter/revue https://help.twitter.com/en/using-twitter/revue Twitter Blue allows posts up to 4000 characters, and a lot of people use Twitter to "blog" with very long threads. Substack competes with that, even if it's so much better that it doesn't really feel like a competition. And now Substack is adding a short-form feature almost identical to Twitter, as the article explains.