I don't understand why we have to blame something or someone else for our own miserableness. I'm a firm believer that happiness is a choice. And that a majority of people choose to be miserable because somehow, some way, they "enjoy" it (consciously or subconsciously).

You're dead right. But most people don't realize the power of thought and how it affects our mood and determines the course of our entire lives. Comparing ourselves with others is a sure way to make ourselves feel worse. Facebook just provides us with an easy opportunity to do that.