They are disembodied, meaning that no body is needed, just language. Partners could be (and already are) artificial intelligences (AIs). They are heavily asynchronous, happening via text-based posts and comments. (A video call is different; it is synchronous.) They involve a substantial number of one-to-many communications, broadcasting to a potentially vast audience. Multiple interactions can be happening in parallel. They take place within communities that have a low bar for entry and exit, so people can block others or just quit when they are not pleased. Communities tend to be short-lived,
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