What is your opinion on posting other friends' photos to Facebook?

You’re at an event and photograph groups of your friends, or individual shots. Do you post those photos to Facebook? Do you ask the people first? Do you identify the people in the photos? Do you tag the photos, so the people are notified that their photos are posted?

I often photograph friends and some ask to have their photos put up, as a method of photo sharing, and others do not react with happiness when their photos are put up. My privacy settings are such that only my friends can view anything I put up. When friends tag me in their photos, the photos are not visible to my friends unless I specifically allow them to be (that’s the beauty of FB – the settings are how you like them). I won’t post photos of people unless I feel the photos are flattering, and I don’t post all of the photos I take. Way more are deleted or left in the phone than are posted.

Just curious what others do. What is your personal protocol on posting friends’ photos to Facebook?