Common Terms...or are they really UNcommon?

Many times I hear people throwing out terms that seem universally understood...terms like Division I, II, or III schools, RSS feeds, or even Twitter! But the more and more I stop to ask others if they honestly understand what these terms mean or what they do, they really don't know! They are just afraid to ask. I have taught my sons that when they don't know something, they should stop to look up what they don't know. Too often people don't take the time to do this simple step to learn, and in this digital age, the answer is only a Google search away. The other day in the car, we were discussing different types of colleges that my son could attend for school. He kept throwing out the terms Division I, II, and III schools, and after asking what he understood these terms to be, I thought it was best to stop and look them up. http://tinyurl.com/6qklzgr 
When I present at technology trainings, the same is true for my students. We see symbols for RSS feeds and even Twitter all the time but people do not generally know what these terms mean or how to use these tools effectively. Sometimes the most common terms are really UNcommon, unless we look them up!