Rupert Murdoch has been called out on his support for 'real black' presidential hopeful Ben Carson, but quickly apologised, declaring "No offence meant."

This is a good example of how there can be a swift misinterpretation to posts on social media. But Murdoch followed the golden rules and apologised quickly and unreservedly.

It is possible to control the message that employees (or business owners) put out on social media every second of the day, much like it is impossible to control their public or private conversations.

Steps can be taken to prevent such slips, however. A sensible, practical policy and guidance can establish the parameters of acceptability and fair and reasonable monitoring and enforcement will back it up.

Everyone makes mistakes, but recognising the reality of human error is essential to maintaining a productive, engaged and positive workforce.