Daily Star's biggest headlines straight to your inbox!Security experts have said that a 'catastrophic network failure' which left billions of users without access to Facebook, Instagram, and WhatsApp could be the result of an internal mistake, though sabotage by an insider 'could also be possible'.The social networking giant has been forced to apologise in the last few hours for the biggest outage in its history, with billionaire boss Mark Zuckerberg saying that he is "sorry" to "the huge community of people and businesses around the world who depend on us."It is not believed to be the work of hackers, but is more likely to have started inside the company by accident with a dodgy update on their systems, tech boffins say.Harvard professor.
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