11. A method of enabling communication by complementary users of a language learning exchange, the method comprising: by at least one processor, executing programming instructions that cause 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 cause the language learning interfaces to present the retrieved content to the first user and the complementary user in either of the languages.
11. A method of enabling communication by complementary users of a language learning exchange, the method comprising: by at least one processor, executing programming instructions that cause 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 cause the language learning interfaces to present the retrieved content to the first user and the complementary user in either of the languages. 14. The method of claim 11 , further comprising, by the at least one processor: enabling either of the users to configure a private content area comprising platform content generated by that user; and enabling the other user to access the platform content contingent on payment of a required fee.