JETSTAR has landed in the middle of a PR disaster after an internet hoaxer hijacked its Facebook page and started snapping at customers.

Customers of the budget airline were left confused and angry when an anonymous prankster registered on Facebook under the name "Jetstar Australia'', and using the airline's official logo, began rudely responding to their queries on the company's official page.

"This is a 'comment box', not a 'write a long story box'. Please shorten it and send it to someone who cares,'' the hoaxer replied to one woman's lengthy query.

Another who inquired about sale prices on a flight to the Gold Coast received the reply: "Don't be such a tight ass, and pay the full price. It's cheap anyway.''

"Have you ever heard of giving up? We have a lot of complaints and unfortunately can not process them all within allocated times. Please stop acting like a spoilt brat and grow up,'' the hoaxer wrote to one man who complained that a previous complaint had not been responded to quickly enough.

The fake Jetstar account even managed to convince one woman the airline had cancelled her flights.

"Are you kidding me! You've just cancelled my family's Gold Coast holiday! Please tell me you are joking,'' the customer responded.

The prankster took screen grabs of the conversations and posted them to Flickr.

Jetstar has since responded with an official message on its Facebook page announcing it is investigating the matter.

"You might have noticed that there have been some inappropriate responses to your feedback on our Facebook pages today,'' they wrote.

"Unfortunately, someone has made a fake Jetstar Facebook and they've been impersonating us. We are currently working with Facebook to get this resolved.''

However it seems not everyone was upset by the prank, with many of Jetstar's Facebook fans declaring it "hilarious''.

"Well done to the person who created this, well done,'' wrote one user, while another simply said: "LOL Legend!''

"The fake account probably deals with customer service better then you clowns,'' wrote another.

The airline is the latest in a string of Australian brands to suffer from a social media stuff-up in recent weeks.

Mexican restaurant chain Mad Mex was yesterday forced to remove a "racist'' Facebook picture depicting Filipino boxer Manny Pacquiao as "Mexican Justin Bieber'' after several users reported it as offensive, while last week Jeep Australia was accused of being "sexist'' for posting a picture of a scantily clad woman to its Facebook page.