Thousands of Facebook users have fallen for a competition promoted by a fake Jetstar page, promising 200 free airfares (five each for 40 people) and five-star accommodation for two weeks in Fiji, with $4500 in spending money.

To enter, the page claimed, all users had to do was like and share the photo posted on the page.

The fake Jetstar Facebook page promises a prize that's too good to be true.

The ploy worked, with the page receiving more than 18,000 'likes' from Facebook users in less than 24 hours. A limited timeframe may have helped, with a claim that the competition would close on July 3.

Telltale signs the page was fake failed to deter thousands of hopefuls. Firstly, the page contained no other content beyond the competition. Jetstar's real Facebook page, which was created in September 2010, has more than 330,000 'likes' and hundreds of posts. Secondly, the competition, which in spending money alone would cost the airline $180,000, on top of the airfare and accommodation costs, is simply too good to be true.