It's curious that you experiment on your close friends though. Why not limit that to strangers or acquaintances? I can't speak for everyone, but it has been my experience that when you are in a close friendship with someone there is a certain level of trust that is expected. Getting "experimented" on might feel a little bit like getting toyed with or lied to if someone views you as a "close friend". You might have better luck including them in the social experiments on strangers as fellow investigators rather than using them as test subjects. Good luck.