Interesting findings on 2nd screen use with TV; though it is a little dangerous to use unqualified findings in such kind of research. Key conclusions: people use a 2nd screen a lot but do not use specific 2nd screen apps. So the 2nd screen is used for what it is good at: being very interactive, and follow up on stuff the viewer found on the big screen, not really to do serious interaction with the content.
But it is recommended that people who have serious stakes in this business understand the background of the research: results could depend on simple issues like how many people had access to such an application and good is it.
Linkedin discussion on this topic: here.