Which social TV analytics company did Twitter acquire in February 2013?

Twitter acquired Bluefin Labs in February 2013, the social TV analytics company that measured audience engagement through online conversation.

Based in Cambridge, Massachusetts, Bluefin Labs analyzed public comments from Twitter, Facebook, blogs, and other sources to connect social reactions with television programs and advertisements. Its technology used timing, language analysis, machine learning, and video fingerprints to determine what viewers were discussing and which broadcasts or commercials prompted those conversations.

Bluefin’s flagship product, Bluefin Signals, was designed for broadcasters, advertisers, agencies, and brands. Twitter saw the acquisition as a way to deepen its role in television measurement and make the relationship between live programming and real-time tweets more useful to media companies. Twitter announced the deal on February 5, 2013. Kantar, Comscore, and Nielsen are all major measurement or analytics names, but they were not the company identified by this acquisition question.