Interesting article but it's been a while since I've so strongly disagreed with everything someone sensible has written down in such a delightful manner ;-)<p>Just to pick two examples:<p><i>success will find the designer who most nearly replicates the world offline online</i><p>No way! Microsoft Bob, anyone? Dragging offline metaphors online <i>can</i> work but it fails more often than it succeeds (it even goes deeper than that - think of those who replicate desktop interfaces on the Web.. eugh!). The online world is a new one, not one that should mirror the offline world. Heck, even the newspaper industry is finally waking up to that one..<p>And with regards to Twitter URLs vs Facebook URLs, etc, I can use my Twitter URL as a URL in all my OTHER social networking sites, on my business cards, in my e-mails, etc.. but Facebook? I need a URL to be able to do that. Further, I'll often use URLs as a direct scheme to find things I want.. example I <i>know</i> that I'll find some interesting Python stuff if I go to: <a href="http://del.icio.us/popular/python" rel="nofollow">http://del.icio.us/popular/python</a> .. or how about interesting "news"? <a href="http://del.icio.us/popular/news" rel="nofollow">http://del.icio.us/popular/news</a> .. these sorts of schemes are a big win whether it's for people's handles, general tags, or whatever.