May be i am against to this question. If you find a person like this. You must help to overcome this problem. Everyone can talk with each others but mostly they don't feel their potential well. So my answer is if a person is social anxiety then i will prefer to them is like people engage related works. first they may be fails but after they must overcome from this issue. I have experience on it. So believe me if you are a social anxiety go for a people engaged work like marketing or business analysts.