At some point of course, people are going to start using data analysis of all your posts and even writing style to build up an entire history of you from all these public posts, this will happen, indeed it's already happening precisely because it is so valuable. So your curation of your online life is really the illusion of control, in fact the culture of google, like that of Facebook, leads me to believe these things will appear at the top of a google search as you fear at some point in your lifetime.