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marked as duplicate by Hilarious Comedy Pesto, Shog9, TheTXI Oct 2 '09 at 18:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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gravatar.com – Brad Gilbert Oct 2 '09 at 18:02
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See this answer: http://stackoverflow.com/questions/392280/what-is-the-algorithm-used-to-generate-those-little-gravatar-identicon-images/392288#392288

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So it's based on gravatar.com/.Is it free ? And what if that site is down? – Shore Oct 2 '09 at 18:46

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