Hey, I don't know, what Couchsurfing does with your address, but I'm VERY certain, it's nothing like advertisers. For Hospitalityclub I KNOW, that nothing happens with your address. It is in an encrypted database and can only be accessed from some volunteers for example for sign-up purposes (plausibility-check and so on). Only if you want to set your address visible to the public, this will happen (I did it like that and didn't receive ANY mail- or phonespam, also because I locked my profile from searchengines). On Hospitalityclub, there's no other advertising then Google-Ads. Hope, this helped somehow. My profiles: HC: tarion CS: knoke