As of right now, I've enabled a system called "reCAPTCHA" to prevent spam comments, not that I've gotten any spam comments yet.

OK, a couple. But instead of being just an annoying roadblock to posting comments, reCAPTCHA is actually useful. The words with which you are presented when you make a comment are words that have been scanned from old books, but cannot be clearly read by the computer digitizing the books. So, to post a comment, you enter two words, one which is already known by the system, and one which is unknown. If your answer to the "known" word is correct, and your answer for the unknown word matches other people's answers, then that word is successfully digitized. You can get all the details on the reCATPCHA
Learn More page.
Enjoy helping digitize old texts!