Blogrolls, needles and haystacks -- a conundrum

Everyone knows that finding good information on the internet is like finding a needle in a haystack, right? In fact, it's worse than that because when you find a needle at least you know it's a needle, as opposed to something masquerading as a needle; you don't have to go looking for objective proof that it's a needle.

So why do so many "edubloggers" think that the concept of blogrolls, which are lists of blogs that subscribers to a blog subscribe to, and similar devices (such as, in effect, shared favorites) are so wonderful?

I can see the (superficial) attraction of having many more potential sources of information, but if finding good information is like finding a needle in a haystack, what is the point of increasing the size of the haystack?

You may have read this before; here's why.