The UK’s Radisson Edwardian hotel chain has launched a unique social media campaign allowing guests to check out two hours later if they announce online that they’re staying at the hotel.

The set-up is fairly straightforward — guests click the “check in” button for the hotel on Facebook Places, an application on the social networking website that allows users to post their current location. Guests can also check in using the Foursquare social network.The campaign, which launched last week, will run until the end of July. Radisson Edwardian did not have exact numbers on participants but admitted that the adoption rate has not been very high yet among guests, but that could change as the campaign rolls along. If it proves successful enough, Smith said the late check-out for social media posting could become a permanent policy for the chain.While allowing the guests to stay late does incur an indirect cost to the hotel, Radisson Edwardian asserts that the free advertising provided by the social network will give the campaign a solid return on investment, especially since the chain views this as providing an additional service to the guest rather than a deal or discount, which would directly pull down rate.The campaign, which launched last week, will run until the end of July. Radisson Edwardian did not have exact numbers on participants but admitted that the adoption rate has not been very high yet among guests, but that could change as the campaign rolls along. If it proves successful enough, Smith said the late check-out for social media posting could become a permanent policy for the chain.