Thanks for the comment, Max. These are really good questions that I didn't address in the article, so I'm going to answer them. After that I'm out of here. I've learned that if you post an article with a title like "What kind of idiot do you think I am, anyway?" people will be very happy to tell you :)
1) Facebook is always welcome to contact me. Happy to help them try to provide login help to the audience I've selected.
2) I don't have results yet, but I promise to post everything you could possibly want to know about the site in a few months. At the slow rate of traffic the site is getting, it's going to take a while to come to any useful conclusions.
3) I don't know. I was going to make an extended metaphor and never really finished it. I was trying to say that the average Facebooker isn't a college kid or programmer any more. They're, well, average. I'll make the change in the edits. This was something I thought about in the shower and just pushed it out there. Wrote the whole thing in 15 minutes without any rewrites, which is unusual for me. Very sorry for the poor quality.
4) Now this question is an awesome one. Riddle me this, batman, how do you use a text-based search engine to provide assistance to people who can't read? If you have no text, the search engine doesn't know what it's looking at. If you have lots of text, people can't use it. If you hide the text, well, search engines don't like that, either.
This was an initial stab. I'd like to try this again with another topic area, but I'm stumped with the problem you bring up. Perhaps a totally video-based site with extensive transcripts? It's worth exploring. You could even do the navigation in video format.
I screwed this site up royally by personally writing the text. I should have asked a elementary school kid to do it. Live and learn.