Thanks for your interest! Prismatic made a beautiful app but took a very different approach toward recommendation. They tried to build, as I understand it, their own social commenting layer on top of news--an effective competitor to Twitter and Facebook--and encouraged linking with social networks. We experimented with the latter in an early version of Recent News but discarded it in favor of a user-focused approach that doesn't require social linking (and isn't as prone to bad recommendations if your friends' interests are different from yours).

In any case Prismatic is no longer updating or supporting its iOS and Android apps. Techcrunch reported in July that Prismatic pivoted to B2B and is trying to make money like Dataminr by selling access to its APIs.