People with social phobia are afraid of being negatively judged or evaluated by others. This leads to fear of doing something that may humiliate them in public - for example public speaking, using public toilets, eating and drinking in public, writing in public, or any social encounters such as parties or workplaces.
Some social phobia sufferers may only fear one type of situation. Others may be concerned about several types of situations. This can lead them to avoid the feared situations, which can lead to severe isolation.