will there be a mechanism to deal with players who elect to leap through the game world while screaming obscenities and posting links to pornographic materials?
the ability to mute/ignore specific people would be nice.
even better would be an option to block *all* in-game interaction with specific people, so that they can't spam you with items, moon/kiss/etc you over and over (sexual harassment?), or knock on your door repeatedly, and stuff like that.
While I would like to see the old-gne-style "soul mates"/"best buddies"/"friends"/"enemies"/"nemeses" get implemented again, I doubt we'll see anything of the sort. "enemies" don't really add anything worthwhile to the game, I think, except for crazy people like me.
although being able to sort/group/split friends into arbitrary user-defined groups would be really really nice. like: "people I know online", "people i know irl", "enemies", "people who owe me money in-game", "people whom i delivery abinsthe when I see them online", etc.
You will have the ability to make arbitrary groupings/categories of your contacts and organize them however you want, and then apply permissions to them (e.g., any of your "BFF"s can enter your house without knocking).
As for dealing with griefing: we will come up with way and means. The most likely thing to happen first is "block" functionality and then we'll see what happens and what is needed as things get more complicated.