If it’s opt-in, explicitly stated, and not limited to groups that the user has declared themselves to be a member of, there’s probably no harm in it—it’d just be another kind of information.
Your original suggestion was missing some of those features, most notably the opt-in option.
If it’s opt-in, explicitly stated, and not limited to groups that the user has declared themselves to be a member of, there’s probably no harm in it—it’d just be another kind of information.
Your original suggestion was missing some of those features, most notably the opt-in option.