Have you ever tried guessing the URL of a facebook page you wanted to visit ? Let's say try searching for the Eraserheads page on facebook. One possible guess would be www.facebook.com/eraserheads
That takes you to this:
|www.facebook.com/eraserheads on Facebook|
This phonomena all came when Facebook introduced vanity URLs which were all up for grabs one midnight several months ago. Everybody wanted to reserve their own vanity URL for easy recall and at the same time grab one before it gets taken. In essence, you could reserve any name you want as long as it wasn't taken. So now, you'd have facebook pages like:
Hopefully, when you look for the page you're looking for, you'll find the right one.