I realise this is all very well for me to say, but I've always known that this was the case and acted accordingly. On a simple level, I've never said anything online that I wouldn't say to my mother or I wouldn't be prepared to stand behind in future. There is no such thing as anonymity on the 'net, never has been. That's the reason why I don't have alt's. There isn't anything to gain.
I do recognise however that most of the non-geek audience won't have thought of this, and may be bitten, but them's the breaks IMO. The expectation of anonymity is no excuse for acting like an idiot. That said my hormones had already raged. Though Dr Aleks Krotoski does say that in the future, people who do not have a complete record, warts and all, will not be taken seriously, because they are not fully three dimensional people.