Oh come on, not enough social information? How much more social information do you people need? Want to know what someone listens to? No need to trawl their car

Oh come on, not enough social information? How much more social information do you people need? Want to know what someone listens to? No need to trawl their car's floor for album covers -- not only do they have their favorite albums on Last.fm, they have a scrobble of every play made in the past couple weeks. There's already a "favorite books" section in Facebook, how long until ebook readers have live integration with the rest of that?