Web Link color

Is the hypertext links color, meant to be blue? Well, yes. Google made an experiment with two type of links color, blue and green, or more precisely using colors between blue and green and guess what? It seams that blue links are more clickable, people are more often click on blue links than green ones (hmm, still wondering why techcrunch is using green links).
But why blue? Why not red links, orange or black? This is a hell of question, since nobody can stand with a strong answer. But let’s list together a few theories about blue “Google” link color, why is this that impressive, what are the possible motivations for people to click on blue links:
1. We’ve got used with blue links from the beginning of the internet, the blue links being used as a universal link color. Nowadays is still the default link color for all the existent web browsers.
2. Blue stands out. I’m not so sure about that. I’m thinking that red is a more powerful color that blue, more dynamic and it should (I think it actually do) do a great job in sales. But let’s just admit that between blue and green, blue stands out.
3. moreover, some designers are even thinking that hypertext links should be either blue or purple (which is actually the color of craigslist links!). Both Gerry McGovern and Jakob Nielsen have a strong belief that should be no links other than blue and purple (the last one for visited links) if somebody really wants users clicking on that links. They think that changing the links color from “default” is confusing the users.