That's the link to the sign-up page for the app. As you can see from the footer, that information is gathered for the purpose of doing demographic analysis as part of our data analysis.
If you want to know the scientific literature on meaning and purpose, there are plenty of sources available. Here's a good overview, and you can follow the footnotes to learn more.
I am not asking for psychological literature on meaning. I am asking what your app is using as a unit of meaning.
Richard Kennaway has posted about an edit war on the wiki. Richard, thank you.
Unfortunately, I've only used the wiki a little, and don't have a feeling for why the edit history for an article is inaccessible. Is the wiki broken or has someone found a way to hack it? Let it be known that hacking the wiki is something I'll ban for.
VoiceofRa, I'd like to know why you deleted Gleb's article. Presumably you have some reason for why you think it was unsatisfactory.
I'm also notifying tech in the hope of finding out what happened to the edit history.