Let alone all the people one hears about who post the hilarious photos of themselves doing That Really Witty Thing With The Cucumber/Traffic Cone/Shaving Foam when completely ratarsed at undergraduate parties, and then get all wounded and taken aback when potential employers subsequently look them up and decide that these candidates may not be the entirely clean-living, studious, sober individuals they claim to be.

I know exactly what toftfroggy means - my employer has a Facebook group, frex, and the thought of work colleagues being able to look up my social stuff, and to some extent the converse, fills me with horror. If you're going to use it as a public profile you'd have to manage your Facebook persona really closely, I imagine, and I'm not sure I have the energy...