1. Send a message to the other party: try to send a message to the other party. If the message can't be sent or the red exclamation mark is displayed, it is likely that the other party has blacked you out.
2. Check the home page: If the other person's user name, avatar and signature are all displayed in your faster friends list, but you can't find anything after clicking on the other person's home page, then it is likely that the other person has blacked you out.
3, attention: try to pay attention to each other, if the attention is not successful, then it is likely that the other party has blacked you out.