These days we have to contend with the creeping power of what can only notionally be defined as media "content"--produced purely to appear at the top of search results. But it appears that the (so far) still entirely human-filtered paradise of Twitter may come to the rescue. Owing to the short path length between any two users, news travels fast in the tweet-o-sphere.
Earlier work suggested that the best way to get noticed on Twitter was to tweet at certain times of day, and Kwak et al.'s paper sheds some light on why this is the case: "Half of retweeting occurs within an hour, and 75% under a day." And it's those initial re-tweets that make all the difference: "What is interesting is from the second hop and on is that the retweets two hops or more away from the source are much more responsive and basically occur back to back up to 5 hops away."