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Great power of synthesis, Bruce! I would like to add to your comments that, in order to find a language partner, it is important to have clear objectives in mind, and a favorite topic. It facilitates comunication, because the prospective partners would know in advance what to talk about.
There is also a problem: fixing a date and hour with a language partner is not easy, because you don`t know the availability beforehand. On the other hand, in order to bookmark a session with a tutor, you simply select the hour within his/her availability!