Out of all anxiety disorders the phobia dictionary labels social anxiety disorder, which is also known as social phobia, as the number one anxiety disorder. Social anxiety disorder is just as it sounds it is the anxiety and fear of being in social situations. Roughly 12% of all Americans will experience some form of social phobia with in their lifetime. Out of those 12%, half have developed the disorder during their childhood. Approximately, 80% of all people who suffer from social anxiety phobia have developed the disorder before their 20th birthday.