Unfortunately having your PI spread over the internet is now an inevitability, if not through your banking then through your shopping or through your social interactions. We all have our PI smeared out over the web to varying degrees, just look at how many sources of information can be used to start profiling someone with a unique username they reuse: http://www.google.com.au/search?sourceid=chrome&ie=UTF-8...
So we protect our online interests as best we can because we have accounts on Hacker News / Twitter / Stack Overflow / You Tube etc. and even if not exposing PI via the registration process, we expose it via our activities and we want to retain control over that important aspect of our lives. But really, how much information you divulge about yourself is a parallel discussion; I want to protect ANY accounts I create onlne, regardless of how little information I provide.
So we protect our online interests as best we can because we have accounts on Hacker News / Twitter / Stack Overflow / You Tube etc. and even if not exposing PI via the registration process, we expose it via our activities and we want to retain control over that important aspect of our lives. But really, how much information you divulge about yourself is a parallel discussion; I want to protect ANY accounts I create onlne, regardless of how little information I provide.