You want to use no follow tags so you don't bleed page rank to the other person's website which means it takes it away from your site. The Google spiders won't be able to read the tag.
HubPges inserts "nofollow" into all links in these Q&A.
And, Google Blogger fans note: Google universally and arbitrarily inserts "nofollow" tags into all links in post page comments whether they are OK with you or not. More reason to host your own sites and blogs (e.g., WordPress).
So, if you put links on sites that make them "nofollow", they do you no good in Google search.
The real reason for no follow link tags is that it is meant to allow authors to link to a page, without passing any "link juice" or pagerank or whatever on to that website. It is a way of saying "this page, but I don't like it"
Some people use it to manipulate page rank, whcih is against guidlines. Some people also do it to give users a link, without themselves being penalised.
Not nonfollow it's nofollow means the name itself resembles not follow. Google wouldn't crawl the tags which are nofollow and they are seems to be useless.
The Nofollow tag was introduced by Google sometime in 2005 as measure to prevent the ever-rising blog comment spam. People were complaining, so Google thought an "off switch" of sorts would be the best course of action.
What the Nofollow tag does is if it is applied to an outgoing link, then no pagerank will be passed along. Effectively, the link is useless in terms of SEO.
However, it is still good practice to obtain Nofollow links, as it is a natural part of link-building.
Don't believe someone who says you should apply Nofollow on all your out-bound links on your site. You won't "leak" any "juice", trust me.
For me the purpose of it is to keep away your site from any spammers who want to link in your site in order for them to get numerous back links.
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