"I hope that on reflection you will accept that I can go no further at this stage, " he added.

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Ask your friend: "Can you accept that I am your superior from 8 until 5, " says Glenn Shepard, a management consultant in Tennessee.

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If I'd like to study your profile, I'll send you a friend request with full details of what we're doing, and you can 'accept' and opt in, or press 'ignore' and I won't be offended.

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"I can pass the message on to the other regions that we accept sometimes you have to wee in a bottle because of lack of facilities, but, if you do, don't throw it out of the window, " he said.

BBC: Lorry drivers urged to stop leaving bottles of urine