Just a facebook question...?

[meowmeow]

so i was just wondering if a stranger likes a photo from my photo album, will they still see the photo/or recent notifications if i were to set the particular photo the stranger liked to friends instead of public?
and also, if i were to set things from public to friends, does friends here apply to friends ONLY or does it also include friends of friends. For example, let's just say i wanted to hide my birthdate from the public and it gives 4 options: public, friends,only me and custom. So if were to choose friends, will my birthdate also be shown to friends of friends? As far as i can remember, facebook used to have the friends of friends settings.
sorry if it sounds a little confusing thanks for the help though