I really wish whoever wrote this had a little knowledge of statistics. Although there is a greater chance that a person has something to hide when he or she is not willing to share with you their Facebook account. However, not having a Facebook account does not by default means a psychopath. In fact, Facebook is literally swarming with all kinds of psychopaths. According to one study, there 83 million fake Facebook accounts.

Facebook has been allegedly used by pedophiles, rapists and even dacoits.

It is totally rubbish to associate Facebook use with any psychopathology. Facebook is simply a web tool which can be used for good and bad purposes. Some may choose it for one reason or the other. Someone may not choose not using it, again for one reason or the other.

Just because two shooters did not have a Facebook account (who knows how many fake accounts they had), we should term all those who are not using Facebook psychopaths? You must be imbecile.