Dieter Bohn, reporting for The Verge on a statement from Suzanne Xie, Twitter’s director of product management:
Xie says Twitter is adding a new setting for “conversation participants” right on the compose screen. It has four options: “Global, Group, Panel, and Statement.” Global lets anybody reply, Group is for people you follow and mention, Panel is people you specifically mention in the tweet, and Statement simply allows you to post a tweet and receive no replies.
I mean, this does seem incredibly easy to bypass. Presumably, you could simply mention the person who published the Statement and not give your tweet the reply distinction. You could also just add a link to the statement to specifically reference what you’re “replying” to. Unless Twitter blocks tweets with links to Statements. But then couldn’t you use a URL shortener?
This will probably prevent some harassment and toxicity on the platform. But unless they make some more fundamental changes to the service, I don’t think it’ll have too much of an impact.