Stackoverflow reputation - worth mentioning in personal statement? It is going to be my last year in school, and I am thinking about studies abroad - I would love to study computer science. Lately, I started participating more in Stackoverflow, answering to PHP, MySQL, and HTML questions. If I manage to answer to a decent amount of questions(now I have 26, I am thinking about ~75-100) would it be worth mentioning in my personal statement (not the number, but that I am participating in the community, providing university with my nickname used here). I have other experiences that I am planning to write there:


I have taught people online of how to use microcomputers
I have taught people of HTML basics
I am writing my extended essay on computer science (I am attending IB diploma program) 
I am currently working on quite a big project for my school using not spaghetti code, but a normal MVC architecture and OOP (at least, I am trying)


Is participating in Stackoverflow community worth mentioning among these (or maybe it is even stronger than what I mentioned?), or not?
If you find value in participating in an activity, then you should feel free to put it in your personal statement. It's no better or worse, say, than including your participation in hosting a neighbourhood PHP class, just that your "neighbourhood" is on the web. Just note the following:


Assessors may not understand what Stackoverflow is, so you may need to spend valuable space informing them about it. You need to describe not only what you do, but why you do it. 
You may have many other activities in which you find value that you would like to feature. This means that the space you use to describe Stackoverflow will compete with space that you could use to describe other things. At its heart, isn't this an economic decision?
Understand that some assessors may look you up on Stackoverflow and assess your work differently. These sites are public, after all. Are you prepared for this to happen?


Good luck!