Facebook is back online after a massive global outage that affected nearly half the world's population. Facebook, Instagram and Whatsapp were down around noon yesterday and didn't come back for hours, marking Facebook's biggest outage since 2008. Facebook has apologized for the incident and says a change to its internal infrastructure had a domino effect on the company's servers. Chris Rouland, CEO of Phosphorus Cybersecurity, joined Cheddar to talk about what may have caused this massive outage and what to expect from the Facebook whistleblower's upcoming testimony on Capitol Hill.