If you find one bad link on a spammy domain, it's usually a good idea to disavow the entire domain, because there's a good chance that there are other links on there that you're just not spotting.
Posts made by MeghanIzzo
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RE: disavow primary domain?
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RE: Will SEO Blogs Divert Traffic from Main Web pages using same keywords?
Having the same keyword targeted on multiple pages of a website doesn't make a search engine thinks your site is more relevant for that term. When multiple web pages seem to be too similar, it can actually send out negative signals.