This mobile app is a social news aggregator that has recommendation engine and adaptive representation features based on your interests (in user profile). It collects implicit feedback from user interaction with the app and integrated this information o user profile.
Zoosk is an app that learns as you click in order to pair you with singles with whom you’re likely to discover mutual attraction. Zoosk’s Behavioral Matchmaking™ technology is constantly learning from the actions of all members in order to deliver better matches.
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P. Dmitriev, N. Eiron, M. Fontoura, and E. Shekita. Proceedings of the 15th International Conference on World Wide Web, page 811--817. New York, NY, USA, ACM, (2006)