Other features include a reader mode for tweet threads, bookmarks folders, and the ability to theme your Twitter app and app icon. Twitter's subscription service first launched in June in Canada and Australia on iOS, but now it's available in the US and New Zealand and on Android and the web. Subscribers can also read ad-free news articles from 300+ participating US sites (based on Twitter's acquisition of Scroll). Surprisingly, you'll still see ads on Twitter even when you subscribe to Twitter Blue, and according to Twitter they are "not currently considering an ads-free product". Link
