|Sacked Kimberley Swann|
Photo: Sky News
Kimberley Swann, 16, made the comment about Ivell Marketing & Logistics in Clacton, Essex, where she had begun working as an office administrator.
Three weeks later, the words "first day at work. omg (oh my God)!! So dull!!" came back to haunt her when her boss discovered them as he surfed the net.
The boss handed her a letter telling her they were ending her employment 'with immediate effect'.
It read: "Following your comments made on Facebook about your job and the company we feel it is better that, as you are not happy and do not enjoy your work we end your employment with Ivell Marketing & Logistics with immediate effect."
The teenager said she was shocked at her treatment as her comments had been on a personal site and not intended to be seen by outsiders - least of all her employer.
She said: "I did not even put the company's name, I just put that my job was boring. They were just being nosy, going through everything. I think it is really sad, it makes them look stupid that they are going to be so petty.
"I was an office administrator so of course it was boring at first and I knew it would get more interesting."
Boss Steve Ivell told Sky News Online Miss Swann posted comments about her job and invited other staff members to read them.
"Had Miss Swann put up a poster on the staff noticeboard making the same comments and invited other staff to read it there would have been the same result," he explained.
"Her display of disrespect and dissatisfaction undermined the relationship and made (her job) untenable.
He added: "We thought that Miss Swann's best interests would be served by working for a company that would more suit her expectations."
Employees are increasingly getting caught out posting unflattering comments on websites.
Last month, Marks & Spencer staff were caught branding customers "idiots" and "cheap little b******s" in a Facebook forum.
In November, British Airways staff caused uproar by calling passengers "smelly and annoying", while Virgin Atlantic sacked 13 crew for describing passengers as "chavs".
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