But it seems, like Facebook's 5,000 friend limit, Google Reader can't handle the sheer mass of shared items Robert shares. I added Robert's shared items to my Google Reader some time ago, and while I've found his selections strong, it's not uncommon for Google Reader to tell me I have new items from that feed, but have them unable for me to see.
For example, in the below screenshot, all my items, with the exception of 8 shared items from Robert, are read.
Yet, clicking on his feed, I am told that, in fact, there are no new items in his feed.
Even going directly to his shared link blog URL doesn't display the new items, but instead marks a point frozen in time, likely the last time Google resynched his feed.
I've never seen the Google Reader team mention a limit as to the total number of feed items in a shared link blog, or any feed. But while I'm subscribed to other link blogs, I've only experienced this behavior with that of Scoble. Could he be running up against an unwritten rule?