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GoogleGuy has explicitly stated that links in blog COMMENTS have little value.
And how does Google know which sites are blogs, which pages and links are in comments, etc?
A third of Google's PhDs are working on this important project right now! ;) Seriously, do you think it would be difficult for Google to identify most blogs? Many of them have distinctive software footprints. Others may be part of blog link networks. If blog spammers can find them, I'm sure Google can.
Google has never balked at a quick fix, even if it's imperfect. Zeus directories named "themeindex" got nuked, while those with other names didn't. I haven't looked at the code lately, but it wouldn't surprise me that MT, for example, has a div named "comments" or similar that would make it easy to analyze where a link occurred.
I think Google knows that blog admins do not want spam in their blog comments. So Google leaves it up to us, the admin, to make sure the blogs are spam free.
How do we do that? Well its a bit off topic, so read this blog entry on how I combat movable type blog spam at the Search Engine Roundtable. This has really worked wonders for me and saved me so much time. [seroundtable.com...]
for instance, "GoogleGuy says blog comment links do not work" or "GoogleGuy says Guestbook links are not counted"...
Think about it. How would Google block these links? With an algorithm. How would the algorithm know it is a guestbook or blog? Well, it could scan for keywords in the title like "Guestbook" or "Blog" and not count these links I suppose. Or it could search in the code for signatures from well known programs (i.e., not count links from comments on sites using the typepad system) Or it could not count links from certain file names, i.e. "guestbook.htm" or "weblog.html".
But, many guestbooks or FFAs will be called anything else, i.e., tile="Add yourself to my visitor log" with the url="visitors.html". Furthermore, there are very many guestbook and blog scripts, does google know about ALL of them? And what about those that are written for that individual site?
For my part, I have seen sites rank PR5 from guestbooks and FFAs alone- for the last six months.
I would not be so quick to say Google does not count these links.
madone, you say in your initial message that you went around signing a lot of blogs, and now your site isn't doing as well as before. It could be one of two things: over the last few weeks, Google has started deploying better technology that negates the effect of blog comment spamming. The changes haven't fully rolled out yet, but it could be that your site just isn't doing as well now that the blog comments aren't doing your site any benefit anymore. The other possibility is that if you did enough blog comments to show up in the blacklist mentioned earlier, or if someone filed a spam report about your site, Google could have investigated, verified that the comments were done by the site in question (you admit this in your first post) and taken manual action to correct the spam.
I personally suspect that they went for a somewhat more elegant solution than just discounting all blog comments, and instead tryed to identify actual blog comment spam instead. But I have nothing to back this up.
So i gues google can identify blogs (i'n my opinion its easy to spot a blog spam).
IMHO are you talking about undefined things... Google has some, what I call "blacklisted referer words" like guestbook, referer, archive, memberlist.php, comments etc.
if these words are part of the URL, but not the domain, the links are NOT counted:
www.guestbook-whatever.tld/mygb.php does count, but
www.guestbook-whatever.tld/guestbook.php does not.
Its not about promoting my blog, its about helping others.
I promote WebmasterWorld almost daily at the blog.
I posted a URL that was on topic and I am sure it was not deleted for a good reason. They can always delete URLs, but that i the mods decision. Sorry if i caused any trouble, I assume a PM would have been more appropriate here.