Hilton Worldwide’s loyalty programme Hilton HHonors has launched “the world’s largest social media treasure hunt”, giving away 500 free hotel nights over the course of five consecutive days this week.

Clues for the treasure hunt activities and locations are being given on the Hilton HHonors Twitter account and Facebook page. HHonors members and treasure hunters must follow or become a fan to uncover the giveaway cities and required tasks.

In each city, the first 100 people to correctly complete the task and find the Hilton HHonors team will be awarded with a free night certificate, redeemable at any participating property in the Hilton Worldwide portfolio of brands.

“Hilton HHonors members, followers and fans in five different cities worldwide will have a chance to take part in a unique event that shows that Hilton HHonors is about more than just points – it’s about the experiences we share with those around us,” said Jeff Diskin, senior vice president, global customer marketing, Hilton Worldwide.

The Hilton HHonors Fast Ways to Free Stays promotion offers members either double HHonors points or a free night certificate (one free night after every four stays or 10 nights) for hotel stays booked between September 27 and December 31 2011, and completed between October 1 and December 31, 2011.