http://www.professionalontheweb.com/p/w/andrea+riezzo/909 has been crawled 12 times going all the way back to June 21, 2007.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
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February 22, 2008

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June 6, 2008

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June 13, 2008

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July 25, 2008

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December 10, 2008

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Note

This calendar view maps the number of times http://www.professionalontheweb.com/p/w/andrea+riezzo/909 was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.