FriendFeed and Twitter have updated their web interface designs. Twitter's updates are largely cosmetic in nature, with the biggest change being moving the tabs for Replies, Direct Messages, etc. to the sidebar. They've also slapped some Ajax on there to just refresh Home or @Replies when you click on them. Thank goodness.

While FriendFeed's new design incorporates a much needed feature: friend lists. Kind of like buddy lists on AOL's Instant Messenger, you can sort the people you've subscribed to Friends, Professional, etc. You can also create your own lists. Another new feature is adding photos directly to FriendFeed.

But the biggest change is the new feature called “Duplicate Detection” — with this new noise-reducing FriendFeed feature, when multiple friends share the same link, the set of duplicate entries will only show up once in your feed.