Twitris, a Semantic Social Web platform facilitates understanding of social perceptions about real-world events by analyzing user-generated data on social media. Twitris addresses challenges in large scale processing of social data, and analyzes data along multiple dimensions including location, time, topic, user, network, sentiment, and emotion. Twitris (latest version v4 available at http://twitris.knoesis.org) incorporates context-based semantic integration of multiple Web resources, and expose semantically enriched social data to the public domain. Semantic Web technologies enable the system's integration and analysis abilities. It has been developed through research of Social Computing group at Kno.e.sis since 2008.
Read more about how Twitris evolved and its key functionalities: http://wiki.knoesis.org/index.php/Twitris