>I got used to the looks of disbelief, thinking that I was some sort of hermit, an antisocial.

I know that look.

>I also got tired of answering the frequent "Why don't you have Facebook?" questions.

I solved it by stating flatly "For the same reasons I don't have Twitter.", somehow marking the final period, people still believes I'm a kind of weirdo, but they don't go on asking ...