The surprise in the graph above is links that originate from youtube: these links have a half life of 7.4 hours! As clickers, we remain interested in links on youtube for a much longer period of time.
But for a news site, the magic number is 24*60/5 = 288. That is, news links become not that interesting only just 5 minutes of sharing.
In many ways this is a self-fulfilling prophecy. To keep people interested you have to produce a lot of new content, but as you do so the older content disappears below the horizon of attention.
tags: information, attention, 10X, payload, social, network