1. A system for enabling communication by complementary users of a language learning exchange, the system comprising: at least one processor; a computer readable storage medium containing programming instructions that are configured to instruct the at least one processor to: identify a first user in a user community of a language learning platform, identify, for the first user, associated profile information comprising a native language and a language of interest, use the profile information to automatically identify a complementary user in the user community who has (i) a native language that matches the language of interest of the first user, and (ii) a language of interest that matches the native language of the first user, cause a first local computing device of the first user and a second local computing device of the complementary user to each output a learning exchange interface through which the first user and the complementary user may communicate in the language learning exchange, receive a source, a category, or a topic from the first user or the complementary user via a topic profile interface of that user's learning exchange interface, retrieve, from a set of language learning content, content that corresponds to the received source, category or topic, and present the retrieved content to the first user and the complementary user in either of the languages via the language learning interfaces.