esto tiene Nofollow?

[Jm Rosón B]

Buenos días,

La etiqueta Nofollow tiene mucha utilidades y fines.

Si te interesa el tema y quieres explotarlo para tu propia utilidad, hay mucha literatura sobre el mismo en este mismo foro y por todo Internet.

Hace poco, pude leer este artículo del señor Matt Cutts:

Hey all, I've been meaning to stop by the webmaster help group, and
the "Popular Picks" thread drew me in. Here's the question I'll
tackle: Admin Aaron asked "What are some appropriate ways to use the
nofollow tag other than to protect against blog comment spam?"

My short answer is that the nofollow attribute on links is a pretty
general mechanism, and you're welcome to use it how you like. Let me
tell you what it does, then I'll give an example or two. I answered a
nofollow question for Rand Fishkin recently. You can read the full
details at http://www.seomoz.org/blog/questions-answers-with-googles-spam-guru
, but I'll quote the important bit:


"The nofollow attribute is just a mechanism that gives webmasters the
ability to modify PageRank flow at link-level granularity. Plenty of
other mechanisms would also work (e.g. a link through a page that is
robot.txt'ed out), but nofollow on individual links is simpler for
some folks to use. There's no stigma to using nofollow, even on your
own internal links; for Google, nofollow'ed links are dropped out of
our link graph; we don't even use such links for discovery. By the
way, the nofollow meta tag does that same thing, but at a page level."


So nofollow as a link attribute causes Google to drop those links out
of our link graph. If you have a nofollow link from page A to page B,
we won't crawl via page A's link to discover page B. Note that we may
still find page B via other links around the web, though.


What are some appropriate ways to use the nofollow tag? One good
example is the home page of expedia.com. If you visit that page,
you'll see that the "Sign in" link is nofollow'ed. That's a great use
of the tag: Googlebot isn't going to know how to sign into
expedia.com, so why waste that PageRank on a page that wouldn't
benefit users or convert any new visitors? Likewise, the "My
itineraries" link on expedia.com is nofollow'ed as well. That's
another page that wouldn't really convert well or have any use except
for signed in users, so the nofollow on Expedia's home page means that
Google won't crawl those specific links.


Most webmasters don't need to worry about sculpting the flow of
PageRank on their site, but if you want to try advanced things with
nofollow to send less PageRank to copyright pages, terms of service,
privacy pages, etc., that's your call.


I gave another example where nofollow would work well at
http://www.mattcutts.com/blog/quick-comment-on-nofollow/ . Someone
wrote an oompa loompa dating site as a joke, but that site started to
get hit with spammy comments. If you write custom software where
you're worried that people might spam the software with links to, I
dunno, Ukrainian porn sites, then you can add nofollow in your
software on the links that you think might be spammed. If a spammer
has a choice between your software and some other software that
doesn't use nofollow, your software might not get hit as often by
spammers.


If you'd like to find out more, Eric Enge and I did an interview that
touched on how Google treats noindex, robots.txt, and nofollow:
http://www.stonetemple.com/articles/interview-matt-cutts.shtml


Hope that helps!
Matt Cutts


Un saludo.

José Manuel Rosón Bravo