I love the idea, I think it's Really Clever.

I can't wait for mobile support, although I noticed the plan is for Firefox users and I'm still stuck on Chrome.

I think a neat feature would be to group multiple sites together for a single individual. For example, following a web comic and connecting that with the artist's Twitter, as a single item.

I'm curious as to whether it keeps track of which items I've seen or whether it only has a staleness measure