But I find it fascinating how much “social” media seems to have increased the level of… uh… Dumbass behavior and the need to record and share every damned thing you do.

I wouldn't necessarily say that social media has increased the level of dumbass behavior (with the exception of being dumb enough to record it). Teenagers and adults alike had plenty of dumb behavior before social media and phone cameras too. Even the desperate need to impress others isn't really new, people have poisoned (with drugs, makeup,...), mutilated (with plastic surgery) or bankrupted (with big houses, cars, boats,...) themselves since long before social media to impress others.