There are no reports of the emergence of social phobia in humans, however it is possible that many of our ancestors have suffered even unknowingly, from Adam to the very present day.
"The first mention of a psychiatric term, social phobia ("phobie des situations sociales"), was made in the early 1900s. Psychologists used the term "social neurosis" to describe extremely shy patients in the 1930s." -
Social phobia - Wikipedia, the free encyclopedia
Sure it may have existed earlier than that, along with every other contemporary psychological disorder. But to our older ancestors it would've been a petty issue compared to survival in the wilderness. Do you think they had the luxury of self conscious worries in the face of starvation, extreme weather conditions, dehydration, disease, and predators? Do you really think they bothered worrying "Gee I hope my fellow tribesmen don't think I look weird as I try to escape this sabre-toothed tiger."
