I also never bothered about the clear differences between those terms although the message I am conveying with those term without paying attention to them will clearly be understood by the readers however its a good thing the OP made clarity of those terms and I will be cautious of how I going to use them in my articles, post e.t.c.
I also know a lot of people don't really pay attention it but its a good thing and high time we began to made clear use of them appropriately in the forum.