I have a forum, user’s can post comments, they can also enable/disable and approve comments; however, I can’t always trust users will disapprove comments linking to bad domains. Like these: http://www.mywot.com/en/forum/3823-275-bad-domains-to-blacklist
My question is two part:
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If a user does hyperlink to a ‘bad domain’ like those in the link above, will my forum/forum-category/forum-category-thread be penalised by it, and even if so if I add no-follow to the forum thread’s links?
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Is there a free API service out there, that I can make a request to to get a list of bad domains, so I can then filter them out of users’ posts?
I maybe being paranoid, but it’s probably because I’m not too SEO savvy.
The actual algorithms aren’t public, but this is what I found looking around the ‘net.
1) Google’s Web master Guidelines says that it may lower ranking for sites that participate in link schemes. As an example of a link scheme, they give “Links to web spammers or bad neighborhoods on the web”. NoFollow may or may not have impact on it, but the consensus seems to be that it doesn’t.
2) You can use either of Google’s two safe browsing APIs to check if sites have been found to be phishing and/or malware sites.