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).