The first expansion to Twitter’s API v2 brings conversation and reply controls. The new endpoints will allow developers to track tweets from particular accounts, those mentioning a certain account, or retrieve a list of accounts who follow a particular user.

source https://gadgets.ndtv.com/social-networking/news/twitter-api-v2-new-features-roll-out-developers-conversation-controls-tracking-tweets-2342552#rss-gadgets-all