In this week’s yearbook Twitter update, we found more fun, interesting stuff and have a question.

We get an intriguing theory on the ramifications of smiling in your yearbook picture, and we’re left asking ourselves what exactly “chavvy” is?

@Alecsoelberg: Just found and finished looking through my high school yearbooks. There was something great about being innocent and naive 6-10 years ago.

@YMG10: Aww i was cleaning my room n started lookin at my yearbooks so many memories…. of people, moments, and just silly stuff.

@CFADBeachwood: Smilers in school yearbooks are more likely to have successful careers and marriages than their poker-faced peers.

@clairerees: Found my school yearbook! Lol. We were all so young… and chavvy!!