One of the hottest US National news stories, this month, is about Hillary Clinton and how she endangered the security of this country by using an insecure email address . One of her mistakes involved her having a friend who had her email address in his address book, when his email account was hacked. And that is how your friends email accounts can be used, to attack your email account. Even if your email account is not revealed, openly, a friend - or fellow blog owner - who reveals her / his email address, can have his / her Blogger account, blog, and email account stolen. And with the possibility that you and your friend exchange emails, there is vulnerability to your email account, your Blogger account, and your blog .