Not all ads are the kind of thing you can block. For instance about the time the term "content" because popular we had the rise of widespread "content" that was merely a way of delivering ads or (much more significantly) the advertisers' perspective.
PS Yes I do recommend adblock and it is the one piece of software I will install on someone else's computer without asking them first. I can't stand it and am so befuddled that someone wouldn't be using it. I also use ghostery but it isn't as mandatory to me.