Facebook tweeted, "We're focused on working to resolve the issue as soon as possible, but can confirm that the issue is not related to a DDoS attack".
A DoS (denial-of-service) attack uses a single computer and internet connection to attack a target and shut it down.In theattack, the perpetrator seeks to disconnect the services by disrupting operations of a host connected to the internet.
A DDoS (distributed denial-of-service) attack, on the other hand, uses several computers and internet connections to do the same thing.
A DoS attack is, therefore, easier to fight back against since it would require the blocking of only one IP address.
Whilenumerous users said they were unable to access the site on mobile phones or computer screens, many others found it working on their phone.
Others just came up against a blank page.