Sheryl Sandberg: Opting out of data-based ads on Facebook would be a 'paid product'00:35
NBC's Savannah Guthrie asks Facebook COO Sheryl Sandberg about providing users with an "opt-out" button to request their profile data not be used for advertising.
TODAY anchors honor Martin Luther King Jr.02:36
TODAY headlines: Kamala Harris running for president; Manny Pacquiao gets robbed00:54
Is a 4-day school week the next trend in education?02:58
Rudy Giuliani admits Trump Tower Moscow talks amid Cohen controversy03:26
At least 2 Americans injured in Syria bombing00:52
Dangerously frigid temperatures follow winter storm03:46