While there were only 35 videos for sociology, there were thousands for many other areas. the quality varies, so I'd recommend checking out the ratings for possible quality. I watched/listened to a few and was both pleasantly surprised and disappointed. Most were hosted by YouTube and some had been removed, so this is a mixed bag.
One idea for a sociological investigation is to have students examine some of the various social media sites for teachers (or students or any profession) to see what kinds of quality of video offerings there are. If there experience is anything like mine, they will find that there is lots of garbage with little updating going on. Many seem to be hastily put together without thought of making the product have deeper meaning than reading words already on the screen. What social factors drive this behavior and lack of quality?