http://techcrunch.com – On the heels of impressive engagement around around this past weekend’s Super Bowl football championship, Twitter today officially confirmed that it has purchased Bluefin Labs, a social TV analytics service. The deal had been reported first yesterday by Business Insider. Terms of the deal have not been disclosed but BI notes that it’s Twitter’s biggest acquisition to date. The acquisition fits in well with how Twitter is developing as a business on two different levels. On one hand, BlueFin’s analytics can be used to enhance advertising services: Twitter is using its st (IT news)