Actually we can change the color using or something similar. But it would be way better if the admin changed the default appearance of all links globally. As it is it is very difficult to tell what is a link and what isn't. Even though people can highlight links in their own posts using the special codes, most people won't remember, or know how, to do that. As it stands it can be rather annoying. I had one today where I was looking for a link to chemgeeks pool equations and couldn't find it even though I was looking right at the sentence that contained it. I ended up reading the HTML source for the page to extract the link.