Some YouTube users were seeing error messages on the site Friday morning.
An "internal service error" message that appeared around 9 a.m. ET showed a monkey with a hammer and code.
The website DownDetector, which tracks reports of service errors, received thousands of reports of problems on the site Friday morning around that time.
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YouTube hasn't immediately tweeted about the issue. The video streaming site gets the second most traffic of any website on the internet behind Google, according to analytics site Alexa.