Not to sound cliche but I'd hope I was not so simple to explain or understand that I could do it in a few dozen words. What man or woman can ever really describe who and what he or she is in a single page... and if that is adequate, how boring and one dimensional must that person be? I won't say I am that complex or that simple, I will say, get to know me then make that decision.
I am a mostly open book, but I prefer to chose with whom I share information rather than doing so as a blanket statement. Perhaps I am old fashioned in that aspect or perhaps it is more of a desire not to "overshare" as most people do when they are online.