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The rules:
1. A maximum of three new threads per day allowed in the forum.
2. A maximum of one new thread per three days per user.

Ad 1. This keeps the total number in the Latest Active Forum Threads panel (the main point of entry for most visitors) down to a reasonable level. Since replies are always possible it can still happen that Diptera threads are occasionally overwhelmed by non-Diptera threads.
Ad 2. This prevents the hijacking of the forum by some users that happen to be online 'first' all the time when a 'new thread' becomes available.