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updated 8/4/2009 10:37:08 AM ET 2009-08-04T14:37:08

The U.S Marine Corps is banning its troops from going onto Facebook, MySpace and other social network sites, citing a possible security risk.

The corps issued an order Monday saying the ban is effective immediately on the Marine Corps computer network. It said the Internet has been used as a haven for malicious behavior, and said that using social sites can expose information to adversaries.

The Associated Press has learned that the move is part of a larger Pentagon review. Deputy Defense Secretary William Lynn last week ordered a review of both the threats and benefits of using social networking — and asked it be done by the end of the month.

The order does not affect Marines' private use of such networks on personal computers outside of their jobs.

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