nearly half the senate grilled zuckerberg five hours yesterday. and the verdict here is he emerged relatively unscathed. in part because there were so many questioners, there was little time left for followup. zuckerberg began the hearing by formally apologizing for host of issues plaguing facebook. >> it's clear now that we didn't do enough to prevent these tools from being used for harm, as well. and that goes for fake news, for foreign interference in elections, and hate speech, as well as developers and data privacy. >> last month it was revealed that a firm with ties to president trump's campaign accessed the data of 87 million users about their consent. that angered users, advertisers, and lawmakers already struggling with facebook's role in spreading misinformation and allowing election meddling. have you heard of fakebook? that's what people call it now. zuckerberg said he was open to regulation. he deflected questions about specifics telling lawmakers this