facebook she says values profits over safety. is she right? that s contrary to my experience. it s contrary to the facts. since 2016 we spent $13 billion on safety security. we have 40,000 people working on security. reporter: haugen will testify against a senate hearing. there is so many different laws need to be passed. regulators have sat on their hands and have done nothing. let s bring in our media reporter sarah fisher. it s hard to conceive the most powerful woman and tech company of the world going dark for a day and not having systems to back them up and get them backup online. what in the world happened? any ideas? totally unprecedented, joe. things like this don t happen. they wanted to make a change in
more people clicks on posts that make them angry, the algorithms will change them to angry ads. reporter: facebook now launching an intense defense. the sweeping assertion of violence after january 6th can be explained by social media is a simplification of the much wider division in society. reporter: a memo obtained by nbc news, while the country rolled back some of its emergency measures, it kept other in place. the company s person says to suggest we encourage bad content and do nothing is not true. since 2016, we spent $13 billion on security. we have 40,000 people working on security. i have seen the constant