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Couldn't you argue that a site that has, say, 80% of its inbound links as "nofollow" fits the profile of an unclever spammer who drops links on forum/blog sites?This sounds possible and perhaps even likely. The question is though: what to do when this profile catches you as a false positive? Stop posting and participating in the community?
the best solution would be to balance the nofollows with followsand was going to say exactly that
... we need to start buying links again! /eyeroll ...but then I kept reading your message and you've said it perfectly yourself :)
What else is there among legitimate sources of do-follow links?
Social media's all I can think ofIn the context of this discussion these would be a special case. Links from social media sites most often come through a non-indexable redirect URL, so, even though they are in the strict sense do-follow (as they appear on the originating page) nothing actually, well, follows because the non-indexable redirect kills it.