<http://schema.org/keywords>
"informatica, how-to, memoria ausiliaria, mac osx, apple, email, exchange, gmail, google apps, iphone, mac, macbook, push, rubrica, sync"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.tommyblue.it/2009/12/04/sincronizzare-i-contatti-tra-iphone-mac-e-gmail/>