Tween heaven and hell

Pool parties and mall hangouts, first crushes and first dates. From the ridiculous to the sublime, being an eighth grader means more angst than one might recognize at first blush. Add the accelerant of social media — with its illusions of perfection and demands for “likes” — and it’s a wonder a kid doesn’t burn out before childhood fades away. Writer-director Bo Burnham keenly observes all of the above and more in his feature filmmaking debut, the comedy-drama “Eighth Grade.”