I think it's better to ask if you can tag them in posts. It also depends on what kinds of posts, the context, and if they're aware of the reasoning. There shouldn't be much risk as long as youre a friend.
Answer:
It really depends on the way you tag them in.
Explanation:
You could say it in many ways like oh I wish you looked like this.
becuase we dont know them
we feel comfortable with family
d
Because if you pick a, b, or c they are wrong.
Both are powerful motivators.