There's nothing wrong with using Facebook, other than the potential impact on working time, but that's not a security matter! The issue is in how your staff configures Facebook, and what information they place on it.
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A few tips to pass on to your staff on the dangers of using Facebook:
One word of advice for the employer -- if you do allow Facebook access at work, block Facebook email using mail filters. At least then you don't have the problem of staff using work email addresses for Facebook. This simple step will then prevent the hacker from making the link between the user and the company they work for.
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