In my recent post on social television, I talked about the ways that mobile devices, apps and social media are changing the television viewing experience.

An increasing number of television shows and films are developing mobile-friendly websites and applications in an effort to encourage fans to use their Smartphones and social media accounts to interact with the show—all while watching the program in real time.

On Twitter, hashtags and trending topics provide instant advertisements to the online world about actors and television programs. Social mentions help to raise a show’s profile, which means that creating the opportunity for a two-screen experience has become a goal for many broadcasters, producers and app developers.

Applications like Get Glue allow fans to check-in to a television show while they’re watching. Similar to Foursquare, Get Glue offers stickers to fans who check-in for a certain amount of time. In June, True Blood teamed up with Get Glue to offer fans a customized HBO True Blood sticker during the season four premiere. By the end of the episode, Get Glue had awarded more than 20,000 stickers to fans and had registered more than 38,000 live check-ins.

Yap.TV is another application that provides live check-ins, while also tying in social media. This social television application allows fans to interact with their friends and other fans of the show in real time through features like user-generated polls and integration with Twitter and Facebook. This provides viewers with a live feed of every mention of the show and gives them the option to interact with one another. Yap.TV also offers a live TV guide, which lists a schedule of all of the television shows airing on various networks.

Get Glue and Yap.TV are just two of the many mobile applications that are getting massive attention from fans around the world. Other social television mobile apps that I suggest checking out are IntoNow and Social Guide.