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So Which SEO Site Really Has the Best Content?

I wanted to know which industry sites had most frequently posted content I felt was worthy of starring. Thankfully, reader gives an average posts / week for each feed, and I could work out how long I had been subscribed to each feed by looking at dates of the first post starred in that feed and the most recent.
After mashing up that data, I was able to calculate the approximate number of posts each feed had published, and what percentage of them I had starred: