Twitter's only failure is that it never returned a profit. When you look at the social landscape, it's hard to argue anyone has succeeded other than Facebook.
Twitter's product is great and it didn't need to be as large as Facebook. It shouldn't need to twist itself for the greatest common denominator users who required immediate gratification via algorithmic feeds and short memes.
TikTok is private, but is said to be losing money. Snap is in the same boat as Twitter as being largely unprofitable. It is unclear if Twitch is profitable either.
Twitter's product is great and it didn't need to be as large as Facebook. It shouldn't need to twist itself for the greatest common denominator users who required immediate gratification via algorithmic feeds and short memes.