Facebook isn’t down, but it did start an odd trending topic on Twitter Friday night as confused iPhone owners tried to figure out why the social network logged them out. I haven’t found an explanation for why this happened, but it appears that everyone accessing the app via an iOS app has to log back in. Many people who use SMS two-factor authentication were initially having trouble reconnecting.
Based on social media posts, many of the people with two-factor authentication enabled could eventually log back in. Still, the SMS codes were prolonged to send, and some have had to upload pictures of their ID to regain access.