When you quote a person, as such
Both, or multiples of either, only send the one alert to the person being quoted and/or tagged. Far better to to just use their username, if you have already quoted or tagged that person. Doesn't save much time, but it does stop the names from popping out at you. Not certain what it does for the system.
There is no need to then tag, that person, @classic33, in the same same post. Neither is there a need to tag the same person more than once in a post.
Both, or multiples of either, only send the one alert to the person being quoted and/or tagged. Far better to to just use their username, if you have already quoted or tagged that person. Doesn't save much time, but it does stop the names from popping out at you. Not certain what it does for the system.