Openness on its own is not a significant competitive advantage. Twitter provides comments, retweets, and already has friends and celebrities. RSS is still ther

Openness on its own is not a significant competitive advantage. Twitter provides comments, retweets, and already has friends and celebrities. RSS is still there on the publishing side for major publishers and all popular blog platforms. So why is it not as popular as email? Maybe individually visiting websites is good enough and maybe that itch is scratched by Twitter.