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[edited by: Robert_Charlton at 11:03 pm (utc) on Apr 29, 2014]
[edit reason] no promotional signatures, per TOS [/edit]
What is a bad one?
Is it preferable to keep just 10 good links among the almost 4000 I have now?
So I should be removing my "link directory" (by the way I have some 4 o 5 pages that kind with less than 8 links each) at first?
A) A 4 images banner (horizontal) where each image links to one site, in general links to a deep page, so user is directed not to another website homepage, but a page insiside the other website more specific.
What are Google's policies and some specific examples of nofollow usage?
Here are some cases in which you might want to consider using nofollow:
Untrusted content: If you can't or don't want to vouch for the content of pages you link to from your site — for example, untrusted user comments or guestbook entries — you should nofollow those links. This can discourage spammers from targeting your site, and will help keep your site from inadvertently passing PageRank to bad neighborhoods on the web. In particular, comment spammers may decide not to target a specific content management system or blog service if they can see that untrusted links in that service are nofollowed. If you want to recognize and reward trustworthy contributors, you could decide to automatically or manually remove the nofollow attribute on links posted by members or users who have consistently made high-quality contributions over time.
Paid links: A site's ranking in Google search results is partly based on analysis of those sites that link to it. In order to prevent paid links from influencing search results and negatively impacting users, we urge webmasters use nofollow on such links. Search engine guidelines require machine-readable disclosure of paid links in the same way that consumers online and offline appreciate disclosure of paid relationships (for example, a full-page newspaper ad may be headed by the word "Advertisement"). More information on Google's stance on paid links.
Crawl prioritization: Search engine robots can't sign in or register as a member on your forum, so there's no reason to invite Googlebot to follow "register here" or "sign in" links. Using nofollow on these links enables Googlebot to crawl other pages you'd prefer to see in Google's index. However, a solid information architecture — intuitive navigation, user- and search-engine-friendly URLs, and so on — is likely to be a far more productive use of resources than focusing on crawl prioritization via nofollowed links.