Messages addressed to spaces

I just realized why the idea of messages addressed to spaces hit me so hard. Email is a message addressed to a person or group, where as blogging (or posting to a newsgroup or web forum) is a message addressed to a space. A group may or may not form at the coordinates of that space. If a group does form, people may be there at roughly the same time, or may visit serially, separated by hours or days or even years. Why does this seem so special and important to me? I'm still not completely sure, I only know that it does.

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