Have you noticed some people on Google+ doing the same annoying thing, over and over? For most, it's not on purpose. It's not their fault that they don't know any better. But the fact is, there's something they're expected to do, or expected not to do, and they're messing it up.
Sociologically, we refer to these as Norms, and there are four different kinds of norms: Folkways, Mores, Laws and Taboo. Unfortunately, while Laws and Taboo are generally documented, Folkways and Mores are less understood and often poorly communicated. As a result, particularly in developing environments like social networks, it's difficult to grasp at first what is and isn't expected of you.
Here are some of the most common mistakes people make on Google+, and what they should be doing differently. See if you can spot a few you recognize.