It stands for "Not Safe For Work", meaning that you might be looking at a thread which might cause discomfort if someone from work were to look over your shoulder while you were reading it.
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tsarstepan
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Mon 3 Mar, 2014 10:10 am
@Wilso,
It's internetese for "Not Safe For Work," meaning the content may contain vulgar language, sexual content, etc... that might not be appropriate to have on ones workoffice computer screen.