I can agree to disagree on things, but I will leave out by saying that the Internet is a global medium that spans multiple continents, cultures, and languages. If the expectation is that everything posted online needs to be thought of through the lens of a global press release, the end result of that is you are going to have a lot less interesting content online and lot less culture.
There is a difference between a truly private post (meaning that no one is supposed to see it) and a targeted post intending to primarily communicate with a specific audience. When I write posts on HN going into programming details, I don't preface them for people who are unfamiliar with the concept of programming. I don't write in the same style on HN as I do in other contexts, and I don't engage in the same topics. All of that stuff is public, people can correlate it if they want to, in which case I'm going to kind of shrug and kind of look at them weird.
This may just be a personal opinion, people are welcome to disagree with me on this, they can disagree with me on anything. But I think transparent communities with their own circles, memes, cultures, and concerns are a good thing, and making those communities more insular, or demanding that they constantly explain themselves to people who don't understand the references, have a background of their concerns and internal debates, or recognize the people involved -- I think that's an unnecessary burden to place on people.