What is Google Giving Credit On Links Rel=Follow And Rel=Dofollow?

Maybe your blog ever get the kind of comments that slipped rel = "dofollow" or rel = "follow" in the html code links from visitors who are aggressively looking for backlinks, for example like this:

<a href="http://example.com" rel="dofollow">example</a>

or

<a href="http://example.com" rel="follow">example</a>

I quite often receive the kind of comments as the above on my blogs a few months ago - especially when the season SEO contest - and I understand it: >>. The commentators fully understand that the blogs (WP platform and Blogspot) I all had the nofollow attribute, so they hope that by slipping rail follow / dofollow on html link, will get points from Google. But is it alleged / expectations?

There was a discussion on the Google forum that begins from an accident in question and is directly accountable by Matt Cutts. From this discussion we can make in reply.
The questioner questioned the rel = "follow" that the slip by the visitors, and after I see her html structure is slightly different from that normally I met and had time to turn the dialogue is quite warm in the forum between members of the forum. Link as this:

<a rel="follow" href="http://www.example.com/" rel="nofollow">Example</a>

As we see the commentators put the "Follow" on the front, then, "Nofollow" on the back. It is not unusual formations above, why add nofollow, if we already know that the blog is a purely use rel nofollow?

The questioner asked:

My question is: will <a rel=”follow” make Googlebot follow the above link?

The question was finally growing into a pretty warm discussion, after a member gives an overview that seemed to give the possibility that this type of html link is potentially in follow by Google:

rel=follow does nothing, but having two rel= attributes might cause G to ignore the second one.

Thus arises the possibility that a link with nofollow will follow in the future on a follow by Google? Matt Cutts gave a very clear answer to this:

Good question. I’ve seen 1-2 other people wondering about this. The short answer is that we’ll make sure the rel=”nofollow” takes precedence. Otherwise spammers could exploit this.

So it is clear that if there are 2 rails in 1 html links, then Google will prioritize / subscribes to the rel = "nofollow", after all rel = "follow" and rel = "dofollow" does not mean. Global Standardization of a link to get points or not: if there is no rel = "nofollow" is not in the presence of rel = "follow / dofollow"

Blogspot and WordPress also no longer bring up that type of rail, if you look at the view source browser, only the rel = "nofollow" that appears. So you should refrain from activities that, because it's useless at all, to build links via Social Bookmarks, Blog Network and other media is a solution looking for the brightest or blogs that are dofollow