suddently think of this today, by using the meta index nofollow, this can prevent the bot from crawling to external site, and thus preventing links to unrelevant site, and to bad neighbourhood as well. is there any proof that this helps page ranking?
Use the meta nofollow will tell search engines not to follow the links on your site. This won't do much for your ranking and will not give you a "get out of spam jail free card" if you're linking to a lot of bad places.
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