This article is from the Pratchett Newsgroups FAQ, by Orin Thomas email@example.com with numerous contributions by others.
Terry Pratchett was a regular on alt.fan.pratchett between
1992 and 1999. He was a regular on alt.books.pratchett between
its inception an 1999. He has had several periods where he
hasn't posted - between 1999 and late 2000 being one.
To give you an idea of exactly how long TP has been on usenet,
if internet years are like dog years - Terry has been around more
than 50 internet years. This is a monumental effort. Consider this,
of the regulars that were on the group when Terry joined in
1992, only 2 or so are still around now.
His last hiatus was caused by the posting of speculative
stories about future discworld events. TP felt that this put him
in an awkward legal position. It meant that he could not use these
ideas if he had independantly developed them because of possible
litigation. There is a *rumour* that a few paragraphs of The
Fifth Elephant had to be cut because someone posted a speculative
article about the future of Sir and Lady Vimes.
So this is a warning - don't post speculative stuff.