Why Facebook and Google's Concept of 'Real Names' Is Revolutionary (2011)
theatlantic.com
theatlantic.com
The problem with this argument is that, irrespective of a real name policy, Google, Facebook, and any other service provider can already create those links since the user agent is essentially a fingerprint (especially when IPv6 is widely deployed). At least the real name policy makes that situation apparent.
Also, the increasing ubiquity of cameras and other sensors does make it likely that someone is going be creating a durable record your public speech acts.