First pics of baby - absolutely not, but seriously who would do that? If it were my sister, and she posted a pic of herself holding her new nephew, I'd be fine with it though. Close family is ok i think... But friends, no! I don't post hardly ever anymore anyway.
Wedding and other... Again, I don't post pics on FB but I reckon it's ok if the person posts lots of pics themselves. If they don't, then no. Same with children. I'd never put up pics of other people's children unless they post lots of pics themselves.
When people have posted pics of me, I get a notification immediately that I have to approve it anyway.