google has many, many ways to link you. Those guys are smart. Like, really, really scary smart. They'll probably link what you had for breakfast this morning at some point
gmail is not the email address service that works, although IMO it works the best, new user, blank cookies, new ip flash...... all that... sometimes that doesn't do it. I think it's similar to amazon, but I think it looks at behaviors as well.
Best advice, mix it up with yahoo, hotmail, live, mail, and gmail
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