Affect of dofollow links on pagerank

If you are in running your own website, you probably already know what dofollow blogs. And for those who are not in the subject, I will explain this point in the article.
First, it is worth noting that any progress in the tops of search results is reduced to banal link building. We mean a set of external links. This, of course, takes into account the similarity of the thematic and regional resources and more.

Some search engines have become a clever algorithm to begin to sift purchased links. Some of them, they do not count for ranking. So what do you do if you can not buy links, do not have other options to get back links?
Course there is! It is true they are not as easy and quick as buying links, but, but they're free, which is important for novice bloggers. Just in time for this method and is dofollow blog commenting.

What is dofollow blogs?

A link Dofollow is followed by Google robot; this affects the PageRank of the page positively or negatively depending on the quality of the links. Most of the sites are enabled by default on Dofollow for the entire structure of the page, except in the comments.
HTML Dofollow

This is a Dofollow link.

 <a href='http://example.com'> example </ a> 

This is a blog where authors deliberately offer for indexing links in comments.

Returning to the subject of promotion of sites links, I must say that dofollow blog commenting is one way to get the fat link to the resource. They say that the comments on these blogs with an open link, tightly moderated, but, in my experience, it is not. Even they often come across spam and advertising, as it hints that our attitude to the authors for their creations.

Negative side:
· Increases the number of empty and impersonal comment.
· The need for continued moderation of comments and, as a consequence, the lack of direct dialogue in the current time, including between commenting.
· Other things being equal commentator rarely becomes a subscriber, because the objective is different, though often I see the opposite - a man who has come for the link, reads everything from cover to cover, and gives his opinion is obviously interested in that comment. This shows the modified causation: instead read and commented on - came for a comment (link) and read.

Output: 

Blog DoFollow is profitable until a certain time. With the growth of traffic - this is more a burden than a benefit (you can see in blogs, at one point closing "nofollow" or taking down a link to the author at all, leaving the opportunity to express an opinion without the possibility of self-PR). Although the more I tend to close comments on "nofollow", to eliminate the selfish motives and finally hear from anyone who wants to respond to the content, with the ability to go to the website of the author on NoFollow link.

How to distinguish from dofolow nofollow?

Strangely, many are asking the question. Learn, open or closed links Robots can own, use your browser firefox go to someone else's blog, select the nickname commentator and on the selection, right-click the mouse, where we select "source selection."And then look at a picture in the source:

In the screenshot, we see that the link has the attribute rel = "external nofollow", from which we conclude that it is not dofollow blog, otherwise this would be an attribute missing. Now, as promised, the list of blogs that was open. The data are from only Google Webmaster. List has the following structure: address, underneath PR ↓

Should I take the comments DoFollow? 

Since the beginning of my blogging adventure, I have always hesitated to attract commentator's links from my comments DoFollow, but I've never done because I always thought there would be a turnaround in my favor. But now for the sake of visibility and interaction with my readers, I think more to go over these concerns.

I hesitate, because for quite some months I learned of the existence of a multitude of robots capable of targeting DoFollow blogs and spammers (passing systems captchas, etc.).. 

I live moderation evil a hundred comments cans per day. I am more skeptical about adding a lot of outbound links on my blog. Indeed, it could discredit my site and content. Search engines supervisors increasingly the practice, I'm afraid of being blacklisted!

In short, I do not know what position to adopt, although I want to have commentators, I do not want to suffer the penalty from Google. How do you advise me? Are you Dofollow, do you feel a difference in your rankings? How you're doing with spammers?

Dofollow / Nofollow in comments 

Leave a comment on a page that has a PR8 is something we all seek, but it happens to the vulnerable page to fill quedaries pointless comments "SPAM" for this reason began to add the attribute Nofollow links for comments, which Google no longer supposed to follow those links, so the SPAM decrease.

Despite this, it is not very clear attribute linking and Nofollow PageRank, we can say this because you share evidence, where the comments are Nofollow site.

This is a site that has PR2, but salamander PageRank have this in an article, with the difference that this article tiene101 comments, investigating the links left in the comments, some have PR6, PR5 and PR4. Then the rest room has PR1, we let the screenshots that were beneath them and a link so that you check for yourself.
Entry page with PageRank 2

The entry has 101 comments with links are nofollow , but apparently Google are ignored, this can be noted that the entry has a PageRank 2.

PageRank 2 only in this entry has 101 comments.

Full Page PageRank 1 

Is the page that corresponds to the previous post, but this is the full product, unlike the previous post, this one has PageRank 1 .

The page has PageRank 1

Conclusion

Will there really difference between Follow and Nofollow?

Evidence shows that despite being Nofollow, positively affect the PageRank of the page.