You can Now Limit Who Can Reply to Your Tweets
https://blog.twitter.comWe saw this was coming in May and now they have rolled it out to everyone.
Here’s how it works. Before you Tweet, choose who can reply with three options:
1) everyone (standard Twitter, and the default setting),
2) only people you follow, or
3) only people you mention.
Tweets with the latter two settings will be labeled and the reply icon will be grayed out for people who can’t reply. People who can’t reply will still be able to view, Retweet, Retweet with Comment, share, and like these Tweets.