Targeting Spam > Nofollow List - An alternative to Drupal's spam link deterrent ...
[Gerard McGarry] The idea behind this filter is that it applies rel="nofollow" to any links in user-generated content. And the reason this is necessary is that when you have a membership site and you allow users to create content on it, you inadvertently attract spammers who want to drop links back to their own site.
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Some related posts from Technorati and Google.
[SEOpittfall] Long Live the No Follow Link Attribute » SEOpittfall: However, if I were purchasing a link, I would consider the source, just like building natural links. You would want to buy a link that is either sending a lot of traffic or gives high visibility or passing value (each of these can be a concern).
[Matt Cutts: Gadgets, Google, and SEO] Twitter added nofollow to “www.” links in their Bio field: Danny said, “Of course, neither platform is “mine” in the sense that Im really using a hosted service thats “owned” by someone else -- Twitter and Google. But the argument is identical for those who think Twitter should somehow nofollow all links to close a “loophole.” Googles Blogger has exact the same type of loopholes, then -- anyone can sign-up, make a fake blog and generate links.
[Online Marketing Blog] What Not To Do With Your Business Blog - Online Marketing Blog: Long days and nights and birthdays turned my mind to wonder and get off topic. I would tend to agree with fantomaster that NOFOLLOW is not a spam deterrent, too.
[Matt Cutts: Gadgets, Google, and SEO] Quick comment on nofollow: Adam, I don’t sell links, so this is all hypothetical, but if I recommend a site to my audience, I’ll give them one link on one page. If the owner of that site wants to buy ad space, the link is going to be prominently displayed, labeled as an ad, and will appear on more than one page.
[All posts on Lullabot.com] Drupal Input Formats and Filters | Lullabot: Filtered HTML: This is the workhorse input format that is used most of the time for displaying posts such as blogs, pages, forum topics and so forth. It combines the URL Filter, the HTML Filter and the Line Break Converter in a way that allows users a small set of HTML tags for formatting while taking care of paragraphs and URLs behind the scenes.
[Popehat] Someone Spams Our Comments With Comment Spam Promoting New York ...: If [attorney] is so awesome Andrew, why does someone marketing on his behalf feel the need to post his awesomeness on our humble blog? I have no doubt, just based on your say-so, that he’s wonderful, but we out those who employ spammers.
Reflected tags on Technorati: Blog, Nofollow, Targeting Spam