Mostly because it took too much time for me to scan through my RSS reader instead of using Twitter.<p>If I see something I like on Twitter, I go to the actual website to read the article (which I assume the author appreciates).<p>Also, using an RSS reader created a lot of subconscious pressure for me to read all the unread entries because it was just another "inbox".  Twitter lists is a better alternative for me because it's just a stream.