not true, the daddy long legs is also known as the "harvestman" spider, but in fact it isnt a true spider as it only has one body segment (compared with a real spiders two).
Thats the uk daddy long legs anyway, I think the americans have different spiders, but they are still not dangerous at all.
THE most venomous spider is the Brazilian "wandering" spider, it is also very aggressive and can jump. However it is not the most dangerous as it lives in forests far from most humans. That title can go to either the Black widow or the Funnel Web as both live in peoples houses and gardens.
As I am on about venom, the MOST venomous animal in the world, above all snakes and spiders is the Box Jellyfish, they are nasty!!