My name is not a URL
factoryjoe.com
factoryjoe.com
Edit: also email puts restrictions on your identity. You're foo at some domain. @foo lets you pick a unique name that's valid online once you're old enough to pick who you want to be, without the footnote of _domain_ attached. Sort of how we all recognize Paul Graham as "pg", which fits his style.
...which is good. I want to be able to choose who I trust with my ID-related information.
But why is that? Is it because people will abuse it and send you data you don't want (spam)?
The same problem applies to twitter ids, except that not many people are spamming yet (I assume).
I guess there's also a single-point to detect spammers, which might make detection easier, but I'd be surprised if that was enough to control the problem.
Just to pick two examples:
success will find the designer who most nearly replicates the world offline online
No way! Microsoft Bob, anyone? Dragging offline metaphors online can 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..
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 know that I'll find some interesting Python stuff if I go to: http://del.icio.us/popular/python .. or how about interesting "news"? http://del.icio.us/popular/news .. these sorts of schemes are a big win whether it's for people's handles, general tags, or whatever.
There's the fear that this involves one part of my life (say, work) with another (say, a weird fan film I did when I was at uni), but I actually enjoy combining them - my business clients enjoy knowing about my Guinness World Record, HN etc.
Five years ago it was much easier for me - probably 80% of the ego surf for my name was me. There's been a glut of Jacob Aldridges reaching their teenage years (and therefore Facebook, media etc) since then - much more diluted Google / Brand results.