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by abrichr 3931 days ago
This is actually a function built in by Google originally to help newspapers etc. It's called "first page free". News sites want their content to be indexed by Google so they can get search traffic, however, Google does not want to send users to a login page, so they compromised Google will index content that is normally blocked by a pay wall in exchange the publication is required to show the full content of that page to any visitor from Google. If you try navigating to another set of answers it will probably require to you login unless you go back to Google and search for it.

Source: http://webmasters.stackexchange.com/questions/3863/how-does-...