First, if you want a very cool infographic on how Facebook makes money, click here (Aldo Baker did an excellent job on this. An excellent read):
http://www.business-management-degree.net/facebook/
TV shows use Facebook and Twitter to reach out to their audience and keep them engaged before, during and after the show.
The only problem from an ROI POV:
a) does this engagement boost the program’s ratings?
b) how much money could a network gain from this?
Fortunately, these questions could be answered once Neilsen and Facebook start tracking this; interesting times indeed:
http://time.com/2990409/nielsen-partners-up-with-facebook-to-track-television-viewing-habits/