Fair. But what if users also had they own RSS feed(s)? They'd select the items/articles they want to share and they get broadcast into (one of) those feed(s). T

Fair. But what if users also had they own RSS feed(s)? They'd select the items/articles they want to share and they get broadcast into (one of) those feed(s). Their friends can subscribe, and why not, comments would easily fit into such a feed as well. Only problem I see is that these users would need a URL for the feed for their friends to subscribe to. So you'd need an external service (like Google Reader was). How about one of these new(ish) open/decentralized social network thingies? I forget their names, there was one that was sort-of-twitter and another sort-of-facebook. They probably already have RSS built-in with various RSS API endpoints for different filters on the stream. Maybe such an idea could ride along with that? Also, I want to echo the other comments, how it is nice that RSS just does one thing. Just means it's a building block.