chilling details tonight. matt, thank you. next, facebook's privacy scandal. larger than first reported. on a conference call this afternoon, ceo mark zuckerberg with the new number and their plans to protect user information. abc's chief business and economics correspondent rebecca jarvis has more. >> reporter: tonight, facebook revealing up to 87 million people, mostly in the u.s., may have had their information improperly shared with political consulting firm cambridge analytica. far more than the 50 million initially suspected. today, ceo mark zuckerberg in a call with reporters acknowledging the company didn't focus enough on preventing abuse. >> we didn't take a broad enough view of what our responsibility is and that was a huge mistake. and it was -- it was my mistake. >> reporter: starting monday, facebook will tell users if their information may have been shared with cambridge analytica, by adding a link at the top of the news feed. the tech titan also announcing several other changes, including restricting access for third party apps and deleting phone and text logs after a year.