My mother has a tendency to skim fiction until she finds an interesting part. Then, if something doesn't make sense, she back tracks to figure out what's going on. I've heard of people skimming non-fiction, but narratives demand a sense of linearity, so it's always bothered me that she does this. Obviously I can't change how she reads, but I've made a point to read every word. I don't always comprehend it all, but I'll read it.
Was that about hubs? Well, generally for me it all depends upon the intro or the opening part of any 'material'...If it can engage me for a while, I'll probably read it through. But when I'm at work, I do SKIM at times...but that can also give you a fair idea about what you were looking for.