I don’t think you can make a generalization about whether people are getting stupider or smarter based on the kinds of questions appearing on fluther. You might say that people are asking a broader range of questions, or that new people don’t understand what fluther is about, or that younger people are participating on fluther. Some or all of these may be true, but even these things are not known for sure.
In any case, you don’t know what people were like before we had question sites. Maybe everyone had questions they didn’t ask because they were afraid it would make them look stupid? While I’m sure you’ve never not asked a question for that reason, there are many people who hold back questions for that reason. On fluther, with the anonymity it provides, you can ask anything you want, and not worry that it will affect your real world reputation.
In any case, I don’t think people are getting dumber. IQ scores go up about 20 points per generation (requiring a recalibration of the scores). People learn more at an earlier age than ever before. Knowledge is more easily available than ever before, and it is getting easier and easier to find out what you want to know, thanks to the internet and sites like fluther. This cannot help but make people smarter. So I am not at all concerned about the kinds of questions being asked here. I, at least, am smart enough to know how to use my “remove” button.