couchsurfing

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The CouchSurfing Project is a free international Internet-based hospitality service. As of October 2007, it had more than 340,000 members in 220 countries and territories. From various indicators it can be estimated that many members were actively using the website, with 40% offering their couches to host travelers (with another 22% saying "maybe" and others who are traveling at the moment). CouchSurfing is currently the largest hospitality exchange network