Twitter is testing a way for users to limit their mentions
 

One of the great things about Twitter is that you can reach out to any public user with a quick @ mention to their username. One of the worst things about Twitter is that it's all too easy to abuse that feature. But it turns out, the bird network may be working on a way to control those mentions. According to privacy researcher and engineer Jane Manchun Wong, the company is testing out the ability to block @ mentions entirely, or limit them to people who already follow you. (Literally, don't @ me, bro.)

https://www.engadget.com/twitter-men...8.html?src=rss