I've posted about this before and it's more true than ever: use two-step verification on your Google account.  Read Mat Honan’s heartbreaking tale of a hack attack if you still don't believe me (http://www.wired.com/gadgetlab/2012/08/apple-amazon-mat-honan-hacking/all/). +Matt Cutts has a nice summary on why and how to do it, see below.
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