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Better safe than sorry. Without a doubt, unless you are at a very small company, there are people that are using the same ID and password across multiple sites and your network if username/password restrictions don't prevent it. I'm sure a lot of passwords that are being used, assuming you didn't assign them, are the same absurdly weak choices that you see again and again: qwerty, password, 12345asdf, john316, etc. Anytime you can use self-interest about things employees care about (oh, noes, my eHarmony account!!!!) to reenforce the importance of basic security practices, you might as well take advantage of it.