Offended by lyrics they deemed too sexual and violent, Tipper Gore and Susan Baker campaigned to put warning labels on albums in 1985. Years later, warning labels have ended up in some unexpected places.

After Napster, many consumers got used to entertainment on demand. There was no turning back.

Every so often, Congress holds a hearing on the perils of pop culture. The “peril” has evolved from comic books, to rock and hip hop music, to violence in video games, but the proceedings follow a script.

As gaming becomes the dominant form of entertainment this century, game developers increasingly track player behavior to tailor experiences that will keep people playing longer and spending more money.