http://www.theatlantic.com/magazine/archive/2003/03/caring-f...
One fourth to a less than a half is not "vastly outnumbered".
PS Or even slightly more than a half: http://www.thoughtful-self-improvement.com/percentage-of-int...
Re:Introducing Graph Search
by shadowmint on Wednesday January 16, 2013 @05:12AM
(#5066173)
http://www.quietlyfabulous.com/2011/01/06/introverts-arent-a...
Here's the cliff notes: “But in 1998, researchers were finally able to do what Isabel Briggs Myers could not: an actual population study. The study was based on a national representative sample – 3,009 randomly selected individuals – which, through weighting of underrepresented groups, was made to approximate the distribution of the 1990 U.S. Census. The findings were clear: introverts and extroverts are equally represented in the population.” (emphasis in original)
So, for Facebook it doesn't matter. As they always do, first they create something that is seen as violating people's notion of privacy. Then they add some form of setting that allows the introverts and control-freaks like you and me that makes it enough for us to not abandon the site, but at the same time allows to still be users.
Also, there is something funny about how you mention not liking to be bothered by strangers in an Internet forum with 10^6 users, but I digress.