https://techcrunch.com/2017/09/27/twitters-apple-watch-app-has-disappeared/

The big Twitter news currently may be the expansion of tweets to support 280 characters instead of just 140, but a number of Twitter users recently spotted another notable change, as well: the Twitter Apple Watch app has disappeared. The app’s iTunes App Store page no longer notes compatibility with the Apple Watch, and users who have updated to the latest versions of iOS and watchOS note the Twitter Watch app is no longer available on their smartwatch.

Specifically, with the roll out of the Twitter for iOS (version 7.8) iOS app, the Apple Watch app was removed, we understand.