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What would be the best and cost effective solution to prevent invalid clicks from PPC.

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closed as not constructive by John Conde Feb 12 '13 at 12:33

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Most, but not all, proxies set the X-Forwarded-For header in the http requests. You can read about it here: http://en.wikipedia.org/wiki/X-Forwarded-For One solution would be to use this header when it is available.

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