In terms of ALL the forums, Celeste (and Saxamaphone, and many others) has been registered at 5MV much longer than Sa'ar (or I) has, yes.
In fact, I think I first registered a few months before Sa'ar did, and Celeste was around long before me, so....
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Yup
“There must have been a point in early human history when it was actually advantageous to, when confronted with a difficult task, drop it altogether and go do something more fun, because I do that way too often for it to be anything but instinct.” -- Isto Combs