Not realistic
I think it's too bad that the main character is this perfect-looking girl with great hair, great body, etc. The reality is that the kids who get cyberbullied usually have something about them that makes them a target. I don't think that kids who watch this movie are going to be able to relate to this beautiful, socially competent girl.
Also, the filmmakers seem to think that calling someone a slut is the worst insult that can possibly happen to a teenager. Have they not seen Easy A? Or met any of this generation's teenagers? Being sexually active is not considered a "loser" quality.