Benedict Evans has written a terrific piece walking through the evolution of Facebook’s News Feed. It’s also one of the clearest, most concise deconstructions I’ve read of the underlying mechanics of feeds in general and how they evolve as they scale. Put it all together and you get a clear roadmap of what Facebook’s near future looks like. And lest you think this is all-Facebook-all-the-time, there’s plenty here that applies to news and product design as well. Both are disciplines where the “feed” concept is a frequent and recurring organizing principle.