we want to know the truth about what the president knew, when he knew it and what he did about it. facebook in the news again. this growing public backlash is announcing new online privacy tools and mark zuckerberg is bowing to new pressure to testify on capitol hill. >> we believe mark zuckerberg will be coming to address congress' questions. >> he's the right person to testify. >> he should also be subpoenaed with documents. >> so a lot to get to. but let's start with what just happened this morning. the state of california stepping into a controversial police shooting death that has ignited protests and outrage in sacramento and around the country. attorney general javier becerra says the california department of justice will serve as an independent investigator into the killing of a 22-year-old unarmed black man stephon clark. he was shot 20 times by police in his grandparents' backyard a week and a half ago when officers approached him, believing he was a vandal breaking car windows.