Facebook tags - ooops !

[Lamplighter]

My son-in-law has a very common name, and his profession legitimately puts him in touch (Facebook friends ?) with many people.
Today his Facebook page says he was "tagged" in a photo, along with a bunch of (30+) other names of people who were "tagged".
The photo of the girl is sort of risque and has a comment that I'm sure he wouldn't want his wife to see.

First a question: Is this "tagging" by Facebook an automatic software thing,
or is someone manually entering the names of the people being "tagged" ?

I don't know how the younger generation is dealing with such issues on these social web sites,
but I know if that happened on my Facebook page there would be a major storm in my marriage.

Caveat emptor !