Its not about discovery or aggregation or being social. Its a way to keep up to date with things you explicitly subscribe to. You have a bunch of sites that you

Its not about discovery or aggregation or being social. Its a way to keep up to date with things you explicitly subscribe to. You have a bunch of sites that you like, which puts out periodic updates. Like a weekly webcomic, or a news site, or local weather alerts. Then you subscribe to those feeds. Then whenever they make a new post, it shows as an update in your reader. Think Twitter, but instead of 280 character posts, they're previews of other webpages.