Thanks, Kenny. It's a worthwhile article to read in full (I particularly like the dot-points on what
not to say to an introvert at the article's end). FWIW, multiple testing, sometimes fairly extensive, of me over the years generally concludes that I am all the way over into the furthest reaches of Introversion (also, Neuroticism, but let's just put that aside here

). So, saying that, I like spellbanisher's post above (post #21) - it clarifies something I've sometimes tried to reconcile with my interest and participation in forums (usually two at the most at any one time) such as MR.
I'm going to tweet the link. Hopefully my family will read it and stop spur-of-the-moment inviting themselves over.
Cheers,
Marc