https://www.vice.com/en_us/article/k7bm7m/elon-musk-finally-broke-twitter

On Wednesday night, a number of Twitter's core features stopped working for many users, including tweeting, retweeting, following, and direct messages. 

When attempting any of these actions, users were presented with an error message informing them that they had reached their daily limit. The platform remained online, but in de facto read-only mode. Some famous users were affected, such as Steve Martin, who tweeted out his own error message, and Motherboard's own account was prevented from tweeting and retweeting. The outage lasted for hours but appeared to be resolved by Thursday morning.