First, it’s important to know that not all backlinks are created equal. Those published on PR0 (“PR” stands for “page rank”—the “0” means the lowest value) sites offer very little weight in search; those published on PR9 (the highest page rank) sites offer very great weight in searches (in fact, a single backlink on a PR9 site might be enough to deliver top-three rankings for a keyphrase in some cases). Examples of high page rank sites include Wikipedia, the BBC, The New York Times, Mashable, etc.
Can I just remind Google that not all “great content” is going to “attract links”, this is something I think they forget. I have great content on my site about plumbers in Birmingham and accountants in London, very valuable, detailed, non-spammy, hand-crafted copy on these businesses, highly valuable to anyone looking for their services. But no-one is ever going to want to link to it; it’s not topical or quirky, is very locally-focussed, and has no video of cats playing pianos.
I’m a bit confused now. If it is better not do place a nofollow, so why does it happen on this site? On the other hand, many sites have a place, where visitors can place links (like this one right here). And so the owner of the page does not guarantee for the links placed (makes sense, since they are not reauthored). So I don’t want do be associated with bad sites and do a no follow. Seems like a workaround, lets see whats going to happen in future.
If you are serious about improving web traffic to your website, we recommend you read Google Webmasters and Webmaster Guidelines. These contain the best practices to help Google (and other search engines) find, crawl, and index your website. After you have read them, you MUST try our Search Engine Optimization Tools to help you with Keyword Research, Link Building, Technical Optimization, Usability, Social Media Strategy and more.
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9. Troubleshooting and adjustment. In your first few years as a search optimizer, you’ll almost certainly run into the same problems and challenges everyone else does; your rankings will plateau, you’ll find duplicate content on your site, and you’ll probably see significant ranking volatility. You’ll need to know how to diagnose and address these problems if you don’t want them to bring down the effectiveness of your campaign.