I've been playing quite a bit recently with FriendFeed - and find that FriendFeed's Rooms feature is very interesting and useful. With Rooms, you can create a place where you can share things of common interest among Room members - including being able to comment on them, etc. Rooms on Friendfeed can be either public or private - and they have their own RSS feeds.
I've setup a public room on FriendFeed called Scott's Kitchen Recipes as a trial. I'll be posting interesting recipes there that I find across the web. If you're interested, join the room and then add you own links and comments! Or follow the activity in the room's RSS feed.