. >> this weekend on c-span, bill clinton and elie wiesel mark the 20th anniversary of the holocaustuseum in washington, dc. saturday. at a: 30, from houston, the national rifle association's annual meeting with an array executives. -- nra executives. although to be, your questions for the world turns upside down author, melanie phillips live in politics, war, history, religion and culture as we start a series with british authors for it on c-span 3, the birmingham race riots, part of american history tv, saturday at 8 a.m. and 3 p.m. -- at 8 p.m. >> the columbia university journalism school held a news conference in the after -- aftermath of the cynical school -- sandy hook school shooting. coming up next, a panel focusing on social media and bad information in the wake of these incidents. this is just over an hour. hi, everyone. welcome back to the afternoon session where we will talk about social media. we have a great deal to discuss, not just about sandy hook but also last week we had a number of lessons that we will be discussing as well. joining me today, i am delighted , a se