i think it would be cool if you could build relationships with other players, therefore unlocking more options of things to do and say with to them, also choosing other actions could ruin relationships making rivals and enemies
There could also be an aspect like system that Diaspora* created, Google+ stole, and Facebook is moving towards. You put people into groups, but people can be in more than one group. Allow certain people in your house, allow some to have access to your plants and animals, maybe even your storage.
There could even be more bureaucratic paperwork that needs done. I like that feature anyway. I can see it cutting way down on people using accounts simply as mules.
I really am liking the idea of expanding the social aspect of the game! I feel like already with the status updates on the Home page, the game is somewhat social-networky, so it'd be kinda neat to expand that a little more, and make it a social network centered on Glitch, and people who play the game.
+1, and I also like the idea of using groups or circles as a basis of who to allow into your house or who you can maybe share a house with.