Actually, many of the threads that are initially cross-posted quickly split into an extropian and transhumanist child-thread, which then diverge. This leads to increased memetic diversity even when the same subject is discussed. I think the practice is not always warranted, but sometimes it makes a lot of sense.
Anders Sandberg Towards Ascension! email@example.com http://www.nada.kth.se/~asa/GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y