Kim Kardashian is many things, but a sketch actor or comedian she is not. So why is the model, reality star and business mogul hosting “Saturday Night Live” this week? No one seems to be sure. Debra Messing summed it up in a tweet, asking “Am I missing something?” Fans of the iconic sketch show were even more blunt, vowing to skip the episode. But Kim’s enormous social media following is expected to provide a lift in ratings, after the season premiere hosted by Owen Wilson flopped.