I'm only a moderate user of Facebook, and I don't use Facebook Messenger at all. However, if a friend messages me on FB Messenger, I get an alert on my phone that I can't clear without going to the desktop site or installing Messenger. I've found that if a friend messages me, I can block them individually when this happens, but I don't want to have to do this each time. Is there a way to disable or otherwise block all Messenger conversations to my account? 
Can I block all Facebook Messenger conversations?
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