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They have very low value. But on the other hand, you are getting refferal Traffic. Secondly, to give natural behivor to search engines. You must have to give it some decent proportion. Otherwise you links become suscpicous in Search engines eyes.
No Follow Links traditionally had little to no value. Even today they are discouraged for Link Building activity, however, many industry experts feel that your linking should be as organic as possible and should be of value rather than using mass links as Search Engines prefer a pattern which is more organic, this could include both nofollow and do follow links.
