I have trouble calling up people and speaking to them. Without doubt, I prefer emailing them. Even meeting them in person is (sometimes!) preferable. There are several theories in the comments of the above article as to why this would be such a common anxiety for introverts. Some seem feasible, some don't. Under rational scrutiny, it seems extremely silly, but I usually end up trying to get others to make calls for me which I could easily make. I sometimes have to practice what I'm going to say, though I do not necessarily lack spontaneity. It's as if each call is like preparing to ask that pretty girl out but anticipating that the burly and over-protective brute of a brother will have to be negotiated first.
When I get down to it, it's not difficult, but it's a relief when done, out of the dentist's door. Thankfully, I'm not totally neurotic and there seem to be others who face this too. Anyway, perhaps a post on life as a practising introvert some day later with special scorn served up for those extroverts around me who can't tolerate the sweet peals of silence :-).
Till then, this super quote from the comments of the afore-mentioned article:
How do you tell if a blogger is extroverted? When he talks with you, he looks at your shoes.(though I think the popular bloggers are likely to be extroverted)