Quite a few people paste in bit.ly links into comments or answers, sometimes even for linking to other pages (or answers within the same page) on Stack Overflow. This way, you do not see where the link is pointing to.
Assuming that there is an API to do this, should the site automatically rewrite the links to point at the original URL?
Are there any benefits to leave them at bit.ly?
Why are people pasting them through bit.ly in the first place? Stack Overflow displays shortened URL anyway, so formatting should not be a concern.