Users experienced poor performances across the web and mobile platforms.
Yesterday morning at 9am PDT (4pm UK time), Twitter engineers clocked on that the mini-blogging service was completely inaccessible for all web users, while mobile platforms failed to display new tweets in users' timelines.
Scaremongers cried tales of hacks, but Twitter shot the rumours down, revealing that it the blackout was due to a 'cascading bug'.
The bug has its particular name because it doesn't just effect one software type, but surges across multiple platforms, which is why users across the world experienced the account freeze.
The firm has ensured the service is fully functional once again, and claims it has had 99.96 per cent reliability across the past six months.
Mazen Rawashdeh, VP of engineering, said: "It’s imperative that we remain available around the world, and today we stumbled. For that we offer our most sincere apologies and hope you’ll be able to breathe easier now."