Many SEO experts will talk about not getting backlinks from link farms and other “bad neighborhoods”. I’m not totally convinced that it will negatively impact you. If that were the case then someone could sabotage someone elses site by just submitting it to link farms and spam ridden sites.

The other one is about topic relevancy. Many SEO experts also claim that if the topic isn’t relevant, you won’t get any benefit. I’m not convinced here because simply sometimes unrelated sites find a good site and want to mention it. Would it be fair to not give the website credit because it’s not relevant? I’m not saying that a relevant site won’t probably have more weight, but certainly there will be SOME link juice passed even between non-related topic websites.

The truth is, I believe EVERY link is a good link provided the site is indexed in Google. If its indexed in Google, then they think its good as far as I’m concerned. Sure every backlink is weighed by many factors, but every backlink will benefit you. On one of my blogs, there was a half dozen crappy scraper sites that were passing me backlinks by the dozens automatically that I had no control over. You’ll find youll get a lot of scrapers if you have good original content. It never hurt my rankings, in fact it seemed to have helped.