Yup, Stack Overflow does do that: http://meta.stackoverflow.com/questions/26964/... | Hacker News

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ak86 on Feb 8, 2012 | parent | context | favorite | on: Pinterest quietly modifying users links to generat...

Yup, Stack Overflow does do that: http://meta.stackoverflow.com/questions/26964/auto-inserting... and http://blog.stackoverflow.com/2009/11/our-amazon-advertising...

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