1, you can judge whether to clone by the integrity of your friend data. Cloning a friend usually completely copies the information of the original friend, including avatar, nickname, personalized signature and so on. If a friend's data is very complete and very similar to any friend's data, it is likely to be cloned.
2. You can judge whether to clone by the activity of your friends. Cloned friends usually don't take the initiative to chat with themselves or participate in social activities such as group chat, because cloned friends exist only to obtain their own information. If a good friend seldom contacts himself or participates in social activities, he may be cloned.
3. You can judge whether it is cloned or not by the relationship of friends. Cloned friends usually add the same friends as the original friends, because those friends want to get more information through their interaction with any friends. If many people in a friend's buddy list are duplicates of his friends, they may be cloned.