This is probably a stupid question but is it possible to block someone on the facebook app or the mobile facebook site or can you only do it on the main facebook site? I'm received unwanted messages from another user and want to block this person from contacting me. I can't access the main site at the moment so thought there might be a way of doing it with the app or the mobile site.
Hmmmm. I don't really pay attention to the email notifications that come from facebook to the app on the device, but if they are somehow unique to each user that is sending them you might be able to set up a filter on the BIS site to block specific ones. Not sure this will work but just a thought.
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Your best bet is to do it from the main site. Now if you're looking to block a message/PM from someone, I don't know if you can do that. I'm sure there has to be a way though, similar to blocking an email.