Is Facebook planning a Digg style feature?

After essentially killing off the HearWhere Facebook app this morning, and replacing it with a simple ability to post links to HearWhere shows on Facebook, I got to wondering if Facebook, and this applies to MySpace almost equally, will add a digg type feature to the site.

Obviously the social network is already in place, and link pages are a somewhat regular occurance.
so how big a step would this be to implement this in profiles.

The same applies for MySpace, though I don't know that linking pages is as ingrained.