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Since then, users have seen error messages appear instead of video content, confirming problems with the service.
Other websites were overwhelmed with traffic as people tried to find more information about the outage.
YouTube is among the most popular sites in existence.
"Still down in Raleigh, the site loads but nothing is displayed".
On opening YouTube, the page is either showing a server error, broken images or a blank page.
Some users trying to access the YouTube homepage received an error message appearing saying: "Sorry, something went wrong".