Facebook Messenger is one of the trending Messenger worldwide but it has many faults that I feel unsafe for everyone because in it your privacy is not safe.
You always logged in and everytime you got your message which excited but it not secure for your privacy because anyone can read your personal message and you get hacked with help of this unsafe facebook messenger.
It also have switch account feature on which anyone can set different passwords or can logged in and you feel unsecure that is not interesting but everything is as not so really good. So install this facebook messenger on your privacy risk friends.