Finally, I got the invitation email from Socialthing! team, a late competitor of Friendfeed. Signed up an account and tried its interface. Services it can support are not as many as FriendFeed, but the interface is much simpler and compact. I am not saying which one is the winner. It's too early to say so. Socialthing! is still at beta version and problems may pop up in the future. We'll see.