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Re:Ask HN: Competitor is successful with black hat SEO by bhartzer on Monday March 20, 2017 @06:11PM (#13918095)
If you don't know what you're doing then disavowing can hurt rankings.

But if you know what you're doing, disavow is awesome. It works.

Re:Ask HN: Competitor is successful with black hat SEO by walshemj on Monday March 20, 2017 @08:05PM (#13918736)
seconded disavow is a powerful tool but not to be used lightly