It's possible that this has been true for some time, but I'm calling it now.
Twitter is the turning point. We'd like to think that we're the ones in control. And of course we almost are. We're active participants. But we've reached the point where the information shapes us, and our actions, to its ends.
Congrats to @jack, @biz, @ev, and the team for creating Twitter. But in a very real sense, Twitter was created by the information. It had to be created, it didn't really matter how or by whom.