"I own the collection of comments on my blog, and you own the comments you've placed on my blog and all others. I should be able to back up a complete set of comments on my blog, and also back up a copy of all comments I've placed on all blogs."
Reader's friend list comes from the list of people you can chat with on Google Talk or Gmail chat. To invite friends to see your Reader shared items, simply invite them to chat. To remove them, delete them from your Gmail contacts, or from your Talk list.
Disruptive technologies, pedagogical innovation: What's new: Findings from an in-depth study of students use and perception of technology. Computers & Education 2008 50 (2): 511-524.
"The smart thing to be doing online these days is tumblelogging, which is to weblogs what text messages are to email - short, to the point, and direct."
APML allows users to share their own personal Attention Profile in much the same way that OPML allows the exchange of reading lists between News Readers.