Aug 16, 2012 at 8:56am ET by Matt McGee Blekko has changed its previously free SEO tools into a paid service, putting it in competition with the likes of,,, and other SEO data/tool providers. There’s been no official announcement of the change, but Blekko CEO Rich Skrenta confirmed to us that the company’s SEO tools and data now require a $99 monthly subscription.

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