It took amazingly little time for the majority of accounts created to be fake. I had two forums with memberships that grew at exactly matched exponential rates

It took amazingly little time for the majority of accounts created to be fake. I had two forums with memberships that grew at exactly matched exponential rates for months. One stayed behind the other, by a constant factor. (One was "I hate Perl", the other "I resent LISP". Resentment, here, was about its never becoming a mainstream language one could find employment coding in.) What was said in them wasn't interesting, but the membership statistics were a constant puzzle.