While singing competition reality shows have been a mainstay on network television for the past decade, their newest iteration could offer an indication of the direction in which social-TV strategies are heading. Rising Star, which premiered on Sunday night and airs in Canada on BCE Inc.’s CTV network, allows viewers to vote — in real time — on which singers will stay in the competition, while contestants perform in front of a giant screen made up of viewers’ social media profiles. The interactive elements of the show are the next step in the evolution of social TV,...