This, I removed FB a few years ago and never even tried Instagram, but my gf has both, and we speak everyday on Whatsapp, and I have a picture on Whatsapp, so they still know pretty much everything about me if they scrap the conversations for keywords or something more advanced.
Tried removing Whatsapp for something like Telegram but couldn't since I need to convince my parents and sisters and gf and friends to move there too.