| http://www.w3.org/ns/prov#value | - sage sender/poster to know if their message has been read by the receiver and also by who all, if it was a Group Chat/Group Post.This is how it looks like: Facebook Read ReceiptThis can be good for the sender if they were sending an important announcement sort of thing and would like a confirmation as to who all have seen the message, But can be creepy and inconvenient for the receiver.
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