My biggest data point is Google. I'm google.com/profiles/<whatever>, but reached at <whatever>@gmail.com. I suppose Googlers get a <whatever>@google.com email

My biggest data point is Google. I'm google.com/profiles/<whatever>, but reached at <whatever>@gmail.com. I suppose Googlers get a <whatever>@google.com email ID. Similarly for Microsoft. I suppose AOL and Yahoo! could be counter-points, though...