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This is already the case. You can't tag a user id you're not connected to.1) you can restrict it so that only connections can tag you (or that the user can only tag connections)
Don't understand what you mean by this. You select the tag from the dropdown, which lists all the users you're connected to. You can also type a name, but will not tag an account based off that name.2) That it tags you by either [username] or [name] (username would be seen as a fallback if [name] is empty.
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