may i ask what the thread in question was about before it was removed?
the reason i am curious is that there is real spam, which is unsolicited commercial e-mail and its usenet and bulletin board equivalent, and then posts which irritate someone because of content and/or past encounters. i am assuming the killed thread is the former and accuse no one posting to this thread of the latter, but i am still curious. the latter is a manifestation of something similar to trollophobia, which is not a good thing and speaks volumes about the relative level of sophistication, mental state, and maturity of the accuser. folks that insecure and/or paranoid should not be posting to public boards, for the sake of their own health and the common good of the posters in the location in question.
as for real spam bot generated in particular, it should be possible to write code into the software to sideline and require moderator approval for posts which have certain spam characteristics based on character strings in the post, number of similar posts in a given time period from a single account (with a "white list" or "do not disturb list" for real people who simply post at high volume), or deemed to be functionally similar by comparison of the text, including line count and the count, range, maximum, minimum, mean, median, sum, standard deviation, covariance, frequency distribution, variance, kurtosis and skewness of the ascii/ansi/ebcidc/whatever values of the characters in the post. having done this with e-mail and newsgroups, i recommend perl for this task. php is not bad either, of course being the language in which nearly all of the programme is written. anything that seems be be slowing down the script can be made into an binary executable with c, fortran, or assembly language --or the perl compiler.