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Re:Stack Exchange grew from 16M to 32M uniques in 2011 by manojlds on Monday January 16, 2012 @07:49PM (#3473296)
Weird part was that though the answers were obfuscated, all you had to do was to scroll down the page and get the answers - what a joke! But the answers were good.
Re:Stack Exchange grew from 16M to 32M uniques in 2011 by icebraining on Monday January 16, 2012 @08:08PM (#3473335)
That's to ensure Google could read them. If they hid the answers the Googlebot wouldn't include them in the search index.