I have been advertising on BackPage dot com for a while (over a year) - Does Google consider this paid links?
Is that a free classifieds ads site? I don't think google may detect that as paid links as far as i know, there's a lot of free classifieds ads site over the net and no one of them get banned or something.
IMO paid links will hurt only if you sell them, as a buyer they can bring no value but I doubt they can hurt
angilina Is that really matters.......! I think what swimbum should take care of is avoid giving irrelevant links to other sites from his own...