The Guardian's Jemima Kiss, writer of the Digital Digest column, has done a good review of how some opinion formers are seeing Facebook's next steps of development as a communications tool. Many have used Facebook, now that it's open to all, to connect to pretty much everyone in their address book (and more) forming a large group of friends, many of which are barely even acquaintances. She quotes Om Malik in her suggestion that Facebook might work better when groups of freinds more closely resemble the size and make-up of a dinner party, not a crowded nightclub.
To an extent I agree. Remember though, Facebook was first developed for groups of friends who are all similar (students). For that kind of a group of friends, the nightclub would be ok. But connections and information-sharing for different levels of groups is not so useful. The nightclub-sized friends group ends up too diverse for Facebook's "social utility" to work as it should. A more diverse user base is presenting new quandries on what you really want your friends to see and it's creating a kind of information overload.
For me the questions are around how I best communicate with people whose contact I value, such as a journalist, a PR or marketing manager, a client, an industry contemporary, that kind of person. Should that be through Facebook at all? Or LinkedIn? Or just the old address book?