Have you turned down new guys request be a friend?Why

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I know i turn them down when i go to their porfile and its just LOEAED with money making sites,I've deleted friends because the spam my PM with money making site links and i've become wary of those people who have lots of the banners on ther profile page. So,if you have recently been denied my friendshoip,it may be because i'm afraid you are a P, spammer of website you want me to join under your name. So do you turn dowm people for reasons?For this reson?If not for this reason,then why do you turn them down?