Replace all social networking with Google's contacts. Let users put whatever they wish in some profile like we can now with our picture in the google contacts. Assign views to everyone, select people, or groups. Through the user's contact profile you can see docs they have made public or shared with you, calendar's they have made public or shared with you, reader items shared and even mail shared.
No more facebook, plaxo, etc. Just google, sweet and simple :)
This combines three ideas into one. First idea, shared earlier hear, have a social networking scheme through Google contacts. If they are in your address book they are in your social network. No more facebook, no more shag space (myspace), just google, sweet and simple. Second idea, allow an aggregation of all your friends bookmarks. Why? Third idea, if the second idea is made anonymous (you don't know who's bookmark it is), you can link it with adsense and let the friend get paid for bookmarking it, if that website is enrolled in adwords.