The latest salvo in the fight for owning users’ identities revolves around URLs. Google just earlier this week promoted profile search and with it URLs of the form http://www.google.com/profiles/awenger (when I signed up for gmail a long time ago I thought shorter would be better – now wish I had chosen albertwenger, as I have on most other services). Facebook is clearly getting ready to launch their version more broadly and is apparently asking users whether they would pay to have a specific...