There's a good Reply All podcast episode about this. They do work. https://gimletmedia.com/episode/18-silence-and-respect/ https://gimletmedia.com/episode/18-si

There's a good Reply All podcast episode about this. They do work. https://gimletmedia.com/episode/18-silence-and-respect/ https://gimletmedia.com/episode/18-silence-and-respect/