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I don't generally use PM systems on websites. It basically boils down to this: if it's something that I don't mind other people seeing I feel that I have an obligation to let people see it (as it may be useful to them), whereas if it's something I do mind other people seeing I shouldn't be putting it online in the first place. Especially so on a website like Hubski, where people choose the content they wish to see. Worse comes to worse, you move it to a new post under a different tag.