A girl has been sacked because she described her job as boring on Facebook.
Kimberley Swann, 16, had been working as an administrator at Ivell Marketing and Logistics in Clacton, Essex, for three weeks when she made the claim, Personnel Today reports.
Although she did not name the company, her co-workers were able to read the comment, which lead her superiors to fire her.
A spokesperson for the firm said that Ms Swann's "display of disrespect and dissatisfaction undermined the [working] relationship and made it untenable".
However, Brendan Barber, the general secretary of the Trades Union Congress, said: "Employees need to be more aware of how they protect their privacy online and employers need to recognise they employ real people, not robots and should grow slightly thicker skins."
A spokesperson for ClickAJob reminds all employees of the need to be discreet.
"Choosing Facebook to sound off is more public than most - but it's not unusual to hear somebody on a mobile, in the street, a coffee bar, or on a train saying all sorts of things that shouldn't be mentioned at all," he says.
"Staff should also remember the non-disclosure agreement most of them sign - that they should not discuss business or any company affairs outside the office."
"That this job was 'boring' is also a warning - most employees are keenly aware they could be doing something better - it's a major reason why people job-hop so much" he continues.
"Of course all of these problems disappear completely when astute managers ensure that staff are properly involved and motivated."
Research conducted by yasni.co.uk, has previously revealed that a fifth of employers say they have been put off a job applicant after seeing drunken or rude photographs of them on Facebook.