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I just noticed in my starred items in Google Reader, that Lifehacker ran an article about Safe Shepherd on April 14th. I'd bet the farm that their userbase saw the greatest increase after the Lifehacker article. It's not scientific, but if you get mentioned on Lifehacker, then you see a jump in users.
1 year, 1 month ago on Personal Info Scrubber SafeShepherd Finds its Flock, Doubles its Userbase In a Month