Regarding FB/FF - Here's how it's [probably] going to work. You will most likely have an account merge, all of the services FriendFeed supports will now be aggregated on Facebook, and all of your FriendFeed friends will be in a "list" on Facebook. The FF Groups will become Facebook Groups. The FF lists will become Facebook Lists.
I made a small journey through FF-sphere. Just to see what other people did theme-wise. Whether they had wanted to be original or liked it more the way it was. So I jumped from 1 account to another by going to the 1st person that had liked or commented on an entry. Does it say anything? Do you have a theme that's especially YOU?