Blogger Buzz: By turning on Backlinks, we include a "Links to this post" section on your post pages. This section is populated by links to that post that have been made from other blogs across the web.
http://buzz.blogger.com/2005/10/introducing-backlinks.html
Randy: I'm wondering how they'll handle blacklink SPAM?
Randy
Randy
They include the ref NOFOLLOW. That's all :D
Yes, that may be turn a big issue.
Saludos!
Mario