Many users have asked that we make it easy for them to see the entries their friends have commented on and "liked." As of today, you will start seeing your friends' comments and "likes" in your own feed.
For example, Paul commented on Fred Wilson's blog post, and I am subscribed to Paul, so now the blog post shows up in my FriendFeed as well:
We highlight your friends' comments within the discussion to make it more obvious why the entry is showing up in your feed.
To maintain privacy, we only apply this "friends-of-friends" view to entries that are public, i.e., the originator of the entry has a public FriendFeed. If your feed is private, your entries and the discussions around those entries will continue to be visible only to those people you explicitly approve. We also don't broadcast the entry past friends-of-friends, no matter how many people comment on it — so if a friend-of-friend comments on your entry, it won't become visible to their friends as well.
We are eagerly looking for feedback on this feature. Our goal is to make the most interesting shared items more prominent so your FriendFeed has a higher percentage of interesting stuff and active discussions. We are pushing this feature out for feedback because it seemed to do a good job at that in our internal testing. You can leave feedback in the comments on this post, or contact us in the FriendFeed discussion group.