From the Facebook Graffiti feature:

More anger stemmed from the wall on the Fan Page:


The medium that caused the firing of 13 employees is the same medium being used to voice grievance against the company. I won't comment on whether Virgin Atlantic was right or wrong in firing the employees since I haven't read all of the details.
My advice for Virgin Atlantic: don't overreact to the negative criticism. You have about 8,000 fans on Facebook and only a few angry comments. Don't get hostile and lash out at the negative comments. It's the internet, it happens.