Philosophically, if you are participating in social networking for the links and not the social side of it, then you are doing it for the wrong reasons anyway..

If the sites are driving traffic then don't worry about the nofollow tag.. If they aren't driving traffic than don't worry about trying to get the link..

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Steve : Animal Charms Animal Jewelry | Fishing Blog
I'm smelling a whole lot of if coming off of this plan.