The CouchSurfing Project is a free international Internet-based hospitality service, and currently the largest hospitality exchange network. As of January 2008, it had more than 400,000 members in 223 countries and territories. From various indicators it can be estimated that many members were actively using the website, with 40 percent
offering their couches to host travelers (with another 22 percent saying "maybe" and others who are traveling at the moment).

But, if you want to use this service: Behave like a decent person, not like you do when destroying that hotel room every year in PCB.