This is a quote from the book "The Gentleperson's Guide To Forum Spies" by Cryptome.org
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Technique #1 - 'FORUM SLIDING'
If a very sensitive posting of a critical nature has been posted on a forum - it can be quickly removed from public view by 'forum sliding.'
In this technique a number of unrelated posts are quietly prepositioned on the forum and allowed to 'age.' Each of these misdirectional forum postings can then be called upon at will to trigger
a 'forum slide.' The second requirement is that several fake accounts exist, which can be called upon, to ensure that this technique is not exposed to the public. To trigger a 'forum slide' and ...