Some time after reading this thread, a few things occurred to me that I hadn't thought of in a while. This doesn't have anything to do with Bethel or this website.
However, I heard about this experience over a year back: A brother's wife left him, and after a year, she joined a JW Dating Site. Long story short: an elder on the other end of town called this man's father, inquired into the situation, and told the father about the profile on the Dating Site. The man had to hear about this from his father…instead of the elder calling him directly. Therefore, it seems logical that there was some monitoring going on.
Another experience, way before the internet, that an older elder once related: They used to "police the flock" in the olden days. In one case, they followed one brother into a gay bar and found him holding hands with another man. And in another case, they followed another brother who was suspected of having an affair with his secretary--but they were never able to prove anything. Eventually new direction came from headquarters to discontinue this. They were no longer to "police the flock".
I guess all this goes in conjunction with what was said by Brother Franz in one of his books, how the Branch spied on a gathering of former Witnesses, taking pictures of those who were going in. The spies were caught and arrested--of course, no trail leading back to the Society. Individuals end up falling on their swords, but the true Masterminds get away.