The diversity of posters, hands down. You've got Australians, you've got the British, you've got French mathematicians, German journalists, Canadian pussies, Hungarian hookers, Italian child-molesters & Morrissey fans. You've got the Finns & Swedes & I'm pretty sure there are many Norwegians lurking all over this place. You've got Atonal, Monkeyboy, Shelle & that Dara chick.
The internet was always a diverse place, but TW is one of the instances where it really comes to fruition. And we all talk about Bowie (at least sometimes).