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Update: Anonymous claims on Twitter that the video is fake, and they do not plan to take down Facebook. Anonymous is planning to target Facebook in an attack Jan. 28 — at least that's what a video uploaded to YouTube Monday is claiming in the name of the hacker network.

And you thought a day without Wikipedia was bad.

"An online war has begun between Anonymous, the people and the government of the United States," the video begins. "While SOPA and PIPA may be postponed from Congress, this doesn't guarantee that our Internet rights will be upheld."

Following the U.S. government shutdown of file-sharing site Megaupload Friday, Anonymous attacked the U.S. Department of Justice's website, among others.

Monday's YouTube video calls on the American people to participate in the hack by downloading Low Orbit Ion Cannon (LOIC), the tool that was successfully used to target the Department of Justice. LOIC crashes websites by sending thousands of information packets to their servers.

The video gives instructions for downloading and running the program, as well as a time — 12 a.m. on Jan. 28 — to launch the attack. No time zone, however, is distinguished.

"Would you like to become part of the greatest Internet protests and first official cyber war?," the video asks. "Operation Global Blackout is ongoing and everyone can be a part of it."

Facebook, of course, is one of the world's largest websites, operating through thousands of servers located across the world. In the video, Anonymous acknowledges the difficulties of attacking such a large site.

“While it is true that Facebook has at least 60,000 servers, it is still possible to bring it down,” says the Anonymous voice. “Anonymous needs the help of the people.”

YouTube commenters have raised an important question, Why would Anonymous want to crash Facebook, after the site came out against SOPA and PIPA?

The video essentially equates the privately-owned company with the U.S. government, with no explanation for the linkage. CNET postulates that Zuckerberg took too long to voice his opposition, landing his social network a spot on the potential targets list.

We've heard this threat before from the global network of hactivists, who promised to shut down the site Nov. 5, 2011, over user privacy concerns. Ultimately, no attack was executed and the loosely-connected hacker network called the threat the work of peripheral members.

Do you think the threat is serious this time around? Let us know in the comments if you think Facebook is a worthy target.

BONUS: A Brief History of Anonymous