There's arguments for apps like Twitter as well but I think most of those use cases could easily be handled through things like notifications services to let me know something has happened.

ENGADGET: Entelligence: Mobile multitasking is mostly a myth

But I can't help noticing that they are rather like the arguments that Bank and other UK officials have always given, when asked about policies or targets that are different from those currently being followed here in the UK. Other countries' targets are always either too rigid - or too flexible.

BBC: Fed gives itself a new target