Just a quick note to say thanks for creating this community.
I'm a chronic joint cracker (started with knuckles, but now includes everything), and have been for some 25 years, starting when I was about 10, I'd guess, and saw a "cool guy" I looked up to doing it.
I think with the increasing prevalence of this habit (characters in movies are starting to do much more frequently), we'll find this bad habit growing, and unfortunately, in the coming decades, we'll learn what the true ramifications of chronic cracking really are.
I have never been able to find any good information on this topic, and I could never believe I was the only one in this situation. I think this community can really be an influential force.
I suggest trying to get some medical professionals to participate directly, particularly Q&A if possible. Perhaps find a professional who has a child that's doing it chronically. Whether it's an OCD or a physical affliction (I'm leaning toward the formerr), doesn't matter. Your quoted material is wonderful – thank you -- but a professional could help add weight and credibility to the site.
In the end, just stick with it. The community will grow, I'm sure of it. And I'm mostly convinced because I believe this is a learned habit. I think we all started because we saw someone else doing it and we tried and tried because it was cool. So many more will do it, too. And I really appreciate that you're here.
If left unabated, I'm convinced this condition (if it's chronic cracking, like mine) will lead to serious problems. We need to stop. This community can help make that happen.
I hope these random thoughts are of some use to you.