Bookmarks launched in 2018 https://techcrunch.com/2018/02/28/twitter-launches-bookmarks-a-private-way-to-save-tweets/ https://techcrunch.com/2018/02/28/twitter-

Bookmarks launched in 2018 https://techcrunch.com/2018/02/28/twitter-launches-bookmarks-a-private-way-to-save-tweets/ https://techcrunch.com/2018/02/28/twitter-launches-bookmarks... Super Follows in 2021 https://blog.twitter.com/en_us/topics/product/2021/introducing-super-follows https://blog.twitter.com/en_us/topics/product/2021/introduci... Birdwatch (community notes) in 2021 https://blog.twitter.com/en_us/topics/product/2021/introducing-birdwatch-a-community-based-approach-to-misinformation https://blog.twitter.com/en_us/topics/product/2021/introduci... all launched before Musk took over.