Big Bang Theory (8pm, CBS) - Leonard has a great idea for a smartphone app, but it causes friction with Sheldon.
The First 48 (9pm, A&E) - A double murder in Charlotte is investigated.
Grey's Anatomy (9pm, ABC) - A mass shooting at a nearby college reopens some fresh wounds at the hospital. Also, Airzona returns to a cold welcome from Callie and Teddy proceeds with her marriage to the cute-but-dying-with-no-health-insurance Henry (Scott Foley).
The Facebook Obsession (9pm, CNBC) - Lester Holt examines Facebook, including its rapid growth and the ongoing concerns over privacy policies. The report also includes good and bad stories from users.
Private Practice (10pm, ABC) - JoBeth Williams guest stars as Addison's mom, who shows up demanding that Addison save her dying partner (Ann Cusack).
Brooke Cain isn't always proud of the number of hours she logs in front of the TV, but her loss of brain cells can be your gain. From reality shows to sitcoms to the more serious stuff, Brooke keeps her DVR smoking so that she can help keep you in the know. Brooke also tweets for Happiness is a Warm TV (you can follow