Facebook Inc. scans the chats and images that people send each other on Facebook Messenger, making sure it all abides by the company’s rules governing content. If it doesn’t, it gets blocked.
Source: Facebook Scans What You Send Other People on Messenger App – Bloomberg
I used the word “reads” because these are not simple keyword scans but machine-learning systems that are the machine equivalent of reading your emails and taking notes.
This further confirms that Facebook is a global surveillance platform spying on every one of us. #DELETEFACEBOOK