Sorry but I can't take the article seriously. The notion that everybody can simply be divided into either being an "Extrovert" or "Introvert" is very doubtful for me. Even if you accept this one dimensional personality description as being useful by itself; - is it constant (the same in all circumstances), - does it vary over time? - Is everyone either an "introvert" or an "extrovert" OR do people fit on a sliding sc…
The words "introvert" and "extrovert" have been used by a lot of people over the years, starting all the way back at Freud I think. If a modern scientist uses these words, though, they're probably talking about it in terms of the Big Five[1] personality model, which is mostly just identifying some observed clusters of traits with strong correlations that tend to persist over a person's life. People argue about whethe…
1. "Many studies have confirmed that in predicting actual behavior the more numerous facet or primary level traits are far more effective (e.g. Mershon & Gorsuch, 1988;[25] Paunonon & Ashton, 2001[26])"
2. Most measures are based on self-description.
So we have a personality description which is not very accurate in terms of predicting behaviour and which also leads to a lot of disagreement (as witnessed by the comments here) about what it actually means in terms of behaviour and human interaction!
If a "measure" is (a) not very accurate and (b) confuses rather than clarifies behaviour / human interaction then for me its not very useful no matter how seductive it is.