I host a general-interest VBulletin forum, which at one point had something like a hundred people posting. One day, we discovered that via the &quot;groups&quot; functionality, there was a whole <i>parasitic</i> forum co-existing with ours - we didn&#x27;t know it existed, we didn&#x27;t know any of the people there, and they didn&#x27;t know us, and the two groups didn&#x27;t interact <i>at all</i>.<p>I wonder if it&#x27;s possible for something similar to happen on specific-interest a messaging board, but just as a function of time zones. (e.g., somehow, most of the population of the board is from Spain and New Zealand, 12 hours apart.)