I agree with you.
As do I. All TV shows always ask people to tweet them and email them and to visit their site. I think the generation of online activity is one the ways their bosses rate the shows.
I don't think Greta cares whether or not the poll is accurate. He goal is to generate 'buzz'. And judging from the fact that we are commenting on it, she was successful.
But Yes. Nobody should take this seriously. It is just a publicity stunt for her show.