In a post on Twitter’s official blog, the company details new relationship with Mass Relevance, which singles out the most relevant tweets for its brand clients, and buzz measurement provider Crimson Hexagon.

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Both Mass Relevance and Crimson Hexagon can bring existing partnerships with media companies to the table. Mass Relevance, for example, recently agreed to power the Twitter integration in NBC’s The Voice, while Crimson Hexagon provided “Twitter analysis” in CNN’s 2010 election coverage and Barack Obama’s first State of the Union address.

Earlier today, it was announced that Shazam for TV will be featured during the second season of the USA Network’s spy drama series Covert Affairs. By “Shazaming” at any point during the show, USA fans will unlock video and photos from Globe Tracker, a multi-media gallery of on-location content shot by the show’s main actor, Christopher Gorham.

With the launch of the new series, Shazam is also introducing a new feature in its app, which allows fans to buy merchandise from a show. As part of a new partnership with Delivery Agent, which manages e-commerce functions for NBC (NSDQ: CMCSA) programming and 40 other entertainment companies, Shazam can provide viewers with a single-button purchase experience to buy fashion brands seen in the show or fan gear from the show.

In the meantime, GetGlue, one of the earliest services to bring the Foursquare-like experience of checking into a shop or restaurant to TV, has been aggressively courting marketers and networks with the beta launch of GetGlue Business, a self-serve marketing dashboard that allows TV, movie and music companies to create more enticements for consumers—such as deals on merchandise. (GetGlue is more than just TV, as it also provides check-ins for movies, music listening and events.)

In addition, Yahoo’s IntoNow has been also striking deals with shows like Project Runway for its check-in service.

The latest entrant into the social TV space is an iPad app, available starting today in the iTunes Store, called Umami, which uses audio fingerprinting technology to automatically and continuously sync to live and time-shifted programming from 40 major broadcast and cable networks. But instead of just checking in, the app offers an array of info related to the show being viewed, including bios, photos, news and conversation.

There is a tremendous amount of research available now about the amount of “multitasking” going on by TV watchers, especially younger ones. But how engaged are they? And do viewers who are hooked on a particular show want to pay more attention to their iPad or their smartphone instead of the actual program?