Thank you everyone and welcome to tonight program. We are very pleased to have joining us this evening zeynep tufecki. She is a contributing opinion writer at the New York Times as well as an assistant professor in the school of information and Library Science at the university of north carolina. And shes also the author of twitter and tear gas which is for sale after tonight program. And for those of you who are not familiar with World Affairs, we are an organization that seeks to explore problems and expand opportunities at the intersection of international policy, philanthropy, and commerce were solutions to our problems lie. We are recording ten nights event with both cspan as well as for radio. So please do take a moment to silence your cell phones, and would like to thank the audio engineer who is joining us this evening. You will notice we have a blue question cards on your seats so pleased to make use of them thought the program and writer programs that and i will bring them up