There is an interesting feature in WhatsApp, although sadly it is only available to Apple devices as of now. Android owners may have to wait for a while. If you have iOS, you can go to ‘Settings’ and then select ‘Account’ and then ‘Storage Usage’. There, you will be able to see the total number of messages at the top of the page and also a list of chats, which are ranked according to the number of messages sent to the number. This helps you see who is your ‘best friend’, as in, to which contact have you spoken the maximum number of lines.