WhatsApp offline for several hours
Found on BBC News on Thursday, 04 May 2017
A second statement from the company, released after the service had been restored, said: "Earlier today, WhatsApp users in all parts of the world were unable to access WhatsApp for a few hours.
Dave Anderson, a digital experience expert at Dynatrace, told the BBC he believed it was likely that an update to the app had caused the problem.
That's wghat you get for relying on a centralized system; there is no "too big to fail".