Unprecedented, except is it
really unprecedented or are we just looking at it from the sexy social startup whatever must say graph and also disrupt angle, where everything is new and super hard and
nobody has problems that have ever been solved before.
RSS strikes me as an almost identical process other than the time subscribers wait to check for new content, and there are feeds with millions of subscribers. So now the problem is reduced to doing it in a timely fashion.
This is why I wonder if they're really that immensely complicated - isn't Google doing much the same thing, and possibly even at a bigger scale at one point, with their reader and FeedBurner?