https://www.cnet.com/news/blackberry-lawsuit-accuses-twitter-of-patent-infringement/

With BlackBerry's inventions, Twitter "has succeeded in diverting consumers away from BlackBerry's products and services" and toward its own by misappropriating features that made BlackBerry "a critical and commercial success in the first place," according to the 98-page complaint (see below).

The lawsuit, filed in US District Court for Central California, seeks compensation for lost revenue and unspecified enhanced damages.