Facebook has long offered the ability to share links on your profile, wall or directly with friends though this feature seems to have taken a very nice social step forward. I just noticed that you can now browse the off-site links while staying within Facebook as seen here:
As you can hopefully see there’s a Facebook frame still holding the page in place which lets me continue to interact with my friend who has offered the content to begin with. This is a terrific idea and it’s seems very well implemented as well.