do sitcoms usually follow social norms or do you think that they have/could have a hand in shaping social norms?

A sitcom, clipping for situational comedy (situation comedy in the U. S.), is a genre of comedy centered on a fixed set of characters who carry over from episode to episode ... Sitcoms originated in radio, but today are found mostly on television as one of its dominant narrative forms.

Sit coms could have a hand in shaping social norms because they are popular.