I use it for all the people I know where we don't share a common proprietary messanging app. I have friends that refuse to use Facebook so don't have WhatsApp.

I use it for all the people I know where we don't share a common proprietary messanging app. I have friends that refuse to use Facebook so don't have WhatsApp. I have friends who are devoted to Apple and don't have anything other than iMessage. I have relations who don't have anything other than the built-in SMS app. I sometimes need to send these people photos of something.