How to use nofollow tags effectively?

SilverHawk

What types of links should I use no-follow tags with for best SEO results?

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jimlynch
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rel="nofollow"
https://support.google.com/webmasters/answer/96569?hl=en

""Nofollow" provides a way for webmasters to tell search engines "Don't follow links on this page" or "Don't follow this specific link."

Originally, the nofollow attribute appeared in the page-level meta tag, and instructed search engines not to follow (i.e., crawl) any outgoing links on the page. For example:

Before nofollow was used on individual links, preventing robots from following individual links on a page required a great deal of effort (for example, redirecting the link to a URL blocked in robots.txt). That's why the nofollow attribute value of the rel attribute was created. This gives webmasters more granular control: instead of telling search engines and bots not to follow any links on the page, it lets you easily instruct robots not to crawl a specific link. For example:

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sspade
Vote Up (7)

There is a great nofollow infographic on Search Engine Land. In short, the nofollow tag tells search engines that your site doesn’t endorse the links, such as in the comment section of a blog. It was developed to prevent spammers from (a) messing up legitimate site’s search rankings, and (b) seeing much benefit from link spamming. 

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