and the experiment worked. the people who saw more positive news seemed happier in their own facebook posts. facebook sort of apologized this week, but not totally. but the story is so much bigger than that one experiment. i'm intrigued by the loarger, long-term, can they influence who you vote for or what kind of news you see during a big political decision? joining me to discussing that in austin texas a researcher and associate at the university of texas. and zanev as unc chapel hills. welcome to you both. i want to hear from both of you first. were you outraged? surprised at all? zanev? >> i wasn't. this is not the first study facebook has published, showing its enormous power.