29 – someone who claims to use internet or watch movies is more likely to be watching movies or using internet than someone who claims not to and whose references say that they are sure he doesn’t. Between 99% – 100% of people who claim to use Internet or watch movies do so. I don’t know the percentages of those who claim not to and really do but it is certainly far less.
Health – most people who are learning don’t use Internet at all. Anyone who does use Internet is automatically exposed to bad things. I doubt that you can find someone who uses Internet on a regular basis (especially if they have to use it for work) who never saw something they shouldn’t have. I have friends who are super-careful about these things who inadvertently saw bad things on the Internet when they were using it for work purposes.