What are "do follow links" and "no follow links"?
Social sites such as Facebook, Twitter, Pinterest, Google plus have higher PR rankings and they are widely accepted for social bookmarking. Hundreds of other sites are in the races which are again advised for bookmarking and to get enough backlinks. Connecting to popular social sites will surely give you quality backlinks. 

Once your blog links are shared with those sites, automatically Google will index your blog links with search engines. For this do-follow backlink will serve all the necessary purpose. Make sure you do not go with no-follow links as they will not give you much positive results. 
What are "do follow links" and "no follow links"?
When your site page gets a click from outside of your own site it is called as a followed link. It is a plus point in terms of SEO. More of such clicks from outside meaning your site is gaining more popularity. 

This way if your site page is clicked from an external source for example HuffingtonPost, you have got a pure gold chance. Such links are called as do-follow links. On other hands, a no-follow link means don't count my click. It advises a search engine not to count this in terms of getting consideration. It doesn't boost page rank neither it is counted. 

Why a "no follow attribute" exists? 

Although no-follow links don't count your site's page clicks in terms of SEO, they play a vital role in building your site's health and brand. Even they bring enough traffic on your website. 

<a href=”http://www.example.com/” rel=”nofollow”>Link Text</a> 

To avoid website spamming and fake external linking and trying to earn reputation made experts work on this issue and brought a term called as no-follow links. 

In the process of forcefully bringing external link juice to their sites started destroying the reputation of other good natural sites and hence a no-follow links came into existence. 

No-follow attributes is a necessary evil! The best example is WordPress automatically assigns "no follow the link" attribute to all user-submitted links to avoid a forceful backlinking. Even Wikipedia does the same thing by adding an automatic no-follow tag to those links.  

To track “do follow” and “no-follow” links on your webpage…

In Chrome go to the navigation bar and click View> Developer > View Source. You can also right-click on a page and click Inspect Element. In Firefox Right click > View page source.

Now search in the normal way do Edit+Find and search “nofollow” and all those links with no follow tag will be highlighted. Extensions such as SEO Quake, Nodofollow, SearchStatus (for Firefox) and NoFollow Simple (for Chrome) are wisely advised to track those links carefully.

To gain success through your website a perfect balance of "do follow" and "no-follow" links is very important. 

A little more study in this way will surely help you decide which areas to focus on putting correct attributes.
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