I have about 80 friends on FB which are a mix of friends, family & a few people I went to school with that I chat to. I know who they all are & if I ever get a request from someone that I have no idea who they are I don't except it. My profile is also private so if you are not a friend all you view is my name, you can't even see a photo or my friends list.
My sister has over 200 people on FB (makes me feel feeble!) & when I asked who some of them were she just shrugged & said 'Dunno' she said they'd invited her & she'd added them (My DSis is 19 btw) but it seems she's not alone in doing that! Am I the only saddo who only adds people she knows?
I have photos of my DC on there so I wouldn't want people I didn't know being to browse them!