Facebook, WhatsApp, Messenger, and Instagram appear to be back online after an outage that lasted several hours on Monday. Earlier on Monday, when one tried to access Facebook, it returned a message: “This site can’t be reached,” adding that the website’s DNS address couldn’t be found. Instagram merely displayed the message: “5xx Server Error.” But at around 5:45 p.m. ET, Instagram and Facebook appeared to be back online for many, according to Downdetector.com. “We’re aware that some people are having trouble accessing our apps and products,” Facebook wrote on Twitter at around 12:30 p.m. New York time. “We’re working to get things back to normal as quickly as possible, and we apologize for any inconvenience.” Hours later, at around 3 p.m., the company’s outgoing chief technology officer, Mike Schroepfer, wrote that the firm is still working to fix the issue. “*Sincere* apologies to everyone impacted by outages of Facebook-powered services right …