I have a guess as to why that's the case: There is a sort of social pressure regarding the number of friends on facebook vs the number of actual friends you ha

I have a guess as to why that's the case: There is a sort of social pressure regarding the number of friends on facebook vs the number of actual friends you have. Adding strangers on facebook is sort of taboo in that it looks like you're just adding random people to boost your stats. I think another reason why the stigma is there comes from the day when the social-casual games were popular (read: zynga). People would add all sorts of strangers to beef up their stats in Farmville or whatever the game du jour was, and it was generally frowned upon