Sure (i just googled my favourite username, and found indeed some pretty old stuff that i'd rather keep forgotten). But listing all the appearances of your online persona is one thing, being able to search for your real-life name and retrieve all the embarrassing info attached to it is another. I'm not saying privacy-conscious persons should obfuscate absolutely everything they publish, but considering how things work, the least anyone should do is to make the retrieval of such information a bit more difficult.