We have covered this topic a few times before but it bears repeating. The solutions that technology gives to social problems rarely solve them and usually come with unforseen consequences. Let's look at the current brouhaha around PB as a case in point. For starters PB has never had an account on @news (which is done here). Additionally Drupal gives @news the option to "write in" a username which PB and many other users take advantage of as a way to have conversations over time.