There was an incident where a student posted something negative about a teacher on Facebook, this was not taken lightly. There were consequences from the parents, teacher, and as well as the administration.
This is a scary culture we are trying to shape. With the scenario (true story) that you gave, it makes one wonder why it is that what is said on social media is given so much clout. It's like the cliche: "Don't believe everything you read", and yet we do.