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Facebook seems to get more similar to FriendFeed every day. The latest, the addition of an "I like this" link on News Feed items, is one of the more significant challenges to the lifestreaming service yet, as it essentially duplicates a major component of what makes FriendFeed tick - a simple, one-click display of indicating your liking of a specific item in a stream of activities and a view of all of the other people that have also liked it.