What's better to detect impersonators? 

Private names: you can change everybody's name to something only you know. You will need to remember the name you like to use. (Like using "Mom" instead of your mom's first name)

Minidenticons: an additional icon that is assembled from the user's pubkey. A different pubkey will be a different icon. You will need to remember the icon associated with each key.

https://private-user-images.githubusercontent.com/33088785/335626312-a6b10871-3c28-4e23-b3a4-f95274d87b77.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.ewNo3cfDzNhuzzGNVXEdJfFERGkrMZMR0ntvPmRTq7w