[retornam]

Bookmarks launched in 2018 https://techcrunch.com/2018/02/28/twitter-launches-bookmarks...

Super Follows in 2021 https://blog.twitter.com/en_us/topics/product/2021/introduci...

Birdwatch (community notes) in 2021 https://blog.twitter.com/en_us/topics/product/2021/introduci...

all launched before Musk took over.