When a user shares a link on facebook it should cross-reference the article/info of the page or video with the user's friends' activities/interests/posts to compile a list of friends who might interested in the topic being shared. The user could then select users to tag with the shared link. The link would be posted on the user's wall and those selected would be notified.For example, if i found an interesting band on youtube and shared the link on my fb wall I would inform me who else is interested in that particular band and I could tag them in the post. All my friends could still view the link along those friends I choose to notify.
