I look forward to the possibility of people being able to create their own "private networks" on Steemit between their friends and acquaintances. eg: sharing photos, status updates, etc. only to their friends, as on Facebook, without them being publicly viewable.

I know this may wander off from the original intent of Steemit, but it doesn't seem it would fall completely out of line either. Their "feed" and follow/follower function is already Twitter-like, although needs a bit more development.