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It's never a good idea to criticise your boss on the internet. But it's certainly not advisable to post an expletive-laden rant that he's able to see.
A young woman paid with her job after seemingly forgetting that she had made online 'friends' with her employer before launching into a tirade.
He could see every posting of hers on social networking website Facebook.
Letting off some steam last Sunday, the woman, known only as Lindsay, began: 'OMG (oh my God) I HATE MY JOB!!'
She continued: 'My boss is always making me do s*** stuff just to p*** me off!!' She also accused her employer, known as Brian, of being lecherous towards her.
It took only a few hours for her fate to be sealed with an acidic response.
Brian posted: 'Hi Lindsay, I guess you forgot about adding me on here?'
He went on: 'Firstly, don't flatter yourself. Secondly, you've worked here five months and didn't work out that I'm gay?
'I know I don't prance about the office like a queen, but it's not exactly a secret.
'Thirdly, that "s*** stuff " is called your "job", you know, what I pay you to do. And lastly, you also seem to have forgotten that you have two weeks left on your six-month trial period. Don't bother coming in tomorrow.
'I'll pop your P45 in the post and you can come in whenever you like to pick up any stuff you've left here. And yes, I'm serious.'
Digital images of the exchange were emailed rapidly around the world.
They included pictures of the pair but with their surnames blanked out. Lindsay is believed to be British and in her teens or early twenties.
It is far from the first time Facebook users have been in trouble for making derogatory remarks about colleagues or customers.
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In January Marks & Spencer staff were caught branding customers 'idiots' and 'cheap little b******,' and last year British Airways staff called passengers 'smelly and annoying.'
This is despite the website warning members to be careful about what they post and who they allow to view their profile.