I've only ever had my first initial on my WhatsApp, even when I'd no idea I'd be seeing escorts I was preparing for it...next level planning..subliminal
Loads of settings on it to keep everything nice and discreet, you can block non-contacts from seeing if you're online, from seeing your pic, just don't save a number in your contact list.
even then you can still block specific contacts from seeing info if you want, I've plenty of business contacts who i block my online status from or I'd have no peace.
miles better than texts in that you can see if a message has been received and read, at least you can be sure with Whatsapp if you're being ignored