Bert,
Company property is company property. As long as you have rules in writing as to what company property can and cannot be used for, you're golden. If you have no such rules, you need to get them on paper and have staff sign off on them. You don't have to be hard about it, you can just say that it's for the protection of company property in light of all the ransomware going around.
Once you catch someone updating their FB status, away they go.
JamesNT
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