Hackers attack Google’s YouTube earlier this week. Hackers had attacked the service user comments on the system of cross-site scripting (XSS).

“The comments service is hidden temporarily as it is in trouble,” wrote Google in a statement by electronic mail. “Repairs will take about two hours.”

Although the hacker attack makes YouTube users become uncomfortable, Google sure that the hacker is not going to attack their Google account. As prevention, YouTube users must log out of their account first and then go back.

Until now, YouTube is the most popular video services worldwide. In May, 14.6 million citizens of the United States are recorded to access video clips on the site or according to comScore, approximately 43 percent of the total online video service.