That's an hypothesis I have, that I believe makes plenty of sense, anyway I haven't found any article about that, although it's not like my search has been exhaustive.
I mean, years ago, on the case you were caught doing something that society finds unusual, the worst thing that was likely going to happen to you were that some people around you, maybe a whole village if you lived in one a bit little, heard rumors about what you did and you had problems with that people around you. On some rare ocassions what you had done would get to the news and you will be highly exposed on the whole country, but it would be extremely strange than more than that would happen.
But now if you make something unusual, there are plenty of people that could record what you are doing and you cannot possibly be aware of everyone, and if you are caught and the video of you is uploaded, for example, to a good bunch of social networks, you are in danger of hundreds of millions of people watching what you have done.
So this looks as a good reason for an increase of social phobia cases.
Are there some studies that confirm my hypothesis?