Quiet Doppelganger Vs. Admitted Wonk

Given the limited reach of my blog, I doubt few have noticed (or will remember), but my doppelganger Mr. Id has made only about half a dozen appearances here since I introduced him in early May. And I have yet to post any of my evil twin's missives via Facebook. However, over the same 7 months, I've routinely referred to myself as a geek or nerd in several different contexts. A few of those postings have gone to my Facebook network. So, what gives? And, who cares?

Well, I guess I care. As I near the finish of an excellent 2003 book called "How To Read Literature Like A  Professor" by Thomas Foster, I thought about blogging about my enjoyment of it. Then I stopped. Wait a minute. Blog about how I enjoy reading books about reading books? I mean, how geeky, nerdy, wonkish can I be? Will anyone care to read about me reading about reading?

So today's decision was not easy- whether I would be public (send to Facebook network) about my geek cup running over again. Or, remain semi-public (as I have with Mr. Id), just post and let the chips fall as they may. Now that I've made that decision, I'll  begin the harder work, i.e. the "what gives?" part - that's where I need your help. What do you suppose prevents me (you) from being more public about the Mr/Ms. Id many of us have bottled up? Put another way, how come it's easier to sometimes characterize ourselves in an unflattering way (me - geek, nerd, wonk; you - fill in the blanks) vs. sharing things that get under our skin?