Just like with many sites, upon signing up you type in your interests to a little profile form; favorite books and movies and so forth. Added to the usual gauntlet, however, is your language resume. See, the deal with this site is trading your mastery of your languages for that of other members: you seek out other members who are fluent in a language you want to learn, and who wish to learn a language you happen to be fluent in, for instance. As long as there's one language in common, communication is bona fide. One of my first conversations on the site was one in (admittedly stilted) English with a Russian about Nabokov's stylistics. I like Nabokov, she likes Nabokov, I speak English, she learns English. Let's talk.