Facebook and Instagram went down for an hour or so last night and the global outage sent users into a panic. All services are now restored, but the situation gave a glimpse into the huge affect a Facebook outage has on the rest of the Web.
In addition to Facebook, users from around the globe also reported "slow or blocked" traffic on other websites during the time Facebook was down. That's likely because many sites allow users to log in using their Facebook credentials.
U.S.-based online match-making site Tinder, a unit of IAC/InterActive Corp (IACI.O), and Hipchat, the workplace instant-messaging service of Australian enterprise software company Atlassian, were also down around the same period, but recovered.
So, how did Facebook go down in the first place? One infamous hacker group is claiming responsibility, but Facebook is telling a different story.