...because it can be simultaneously intimate and public. For that reason, Facebook, Twitter, etc. - and even blogging - are not as easy to figure out, from a productivity standpoint, as they seem. Even email can be problematic because even the most personal email can be leaked. These are global, psychological, sociological and technological forces that are at play every time we communicate online, and we're all - individually and as a global society - still trying to figure them out!