Agreed. It's logical too. Most high schoolers and college students have a very small network of friends, acquaintances, family, etc. (in relative terms). Once

Agreed. It's logical too. Most high schoolers and college students have a very small network of friends, acquaintances, family, etc. (in relative terms). Once you get into the real world, you have to deal with people all over the place, oftentimes whom you've never met before. That's when email becomes truly useful. Alternative hypothesis: after college, people aren't as concerned with appearing "cool," so Facebook Wall Posts really don't matter much anymore.