They can't unless there's some phpBB mod that lets you do it. However, they could create a forum only they can access and pad their count there. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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