Quote:
As long as we’re talking about links, this seems like a pretty good opportunity to talk about a simple litmus test for paid links and how to tell if a paid link violates search engines’ quality guidelines. If you want to sell a link, you should at least provide machine-readable disclosure for paid links by making your link in a way that doesn’t affect search engines. There’s a ton of ways to do that. For example, you could make a paid link go through a redirect where the redirect url is robot’ed out using robots.txt. You could also use the rel=nofollow attribute. I’ve said as much many times before, but I wanted to give a heads-up because Google is going to be looking at paid links more closely in the future.
The other best practice I’d advise is to provide human readable disclosure that a link/review/article is paid. You could put a badge on your site to disclose that some links, posts, or reviews are paid, but including the disclosure on a per-post level would better. Even something as simple as “This is a paid review” fulfills the human-readable aspect of disclosing a paid article.
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Pay link for traffic with "nofollow" attribute will be ok but all pay links without "nofollow" attribute will probably be red flagged.
Bottom line is this:
Google is going to be looking at paid links more closely in the future
by mattcutts.com