Facebook was unavailable worldwide for more than 30 minutes on Thursday morning, the longest outage on the site for four years. Both the website and the company's smartphone and tablet apps were affected, as users decamped to other social networks to complain about the failure. The site collapsed at 8:53am BST, showing visitors the following error message: "Sorry, something went wrong. We're working on getting this fixed as soon as we can." It stayed unavailable until 9:24am BST, when the site and apps began working as normal.