It’s easy to add or remove individual people from a friend list, but at first, there’s no obvious to way to make larger, bulk changes. That’s where the subtle, almost hidden, Select Multiple Friends link comes in. (It’s next to the “Add to List” text box where you can type in a person’s name to add to the friend list.)
It pops up a window that shows your friends visually, in a grid, and lets you click to add or remove them. The same interface is used for inviting people to events and groups, among other things. It’s even exposed to Facebook Apps as Fb:multi-friend-selector.
It’s not all sunshine and kittens, though. The News Feed Preferences page, which lets you control which people and stories show up on your home page and news feed, is missing out. Its “More/Less About These Friends” lists are in desperate need of friend list love!
Otherwise, friend lists are great, especially the RSS feeds. With those, I barely have to use Facebook itself at all!