I'm not sure if WhatsApp's chat data is accessed by FB too. I thought it was impossible after they implemented end-to-end encryption. A friend of mine recently

I'm not sure if WhatsApp's chat data is accessed by FB too. I thought it was impossible after they implemented end-to-end encryption. A friend of mine recently bought a mattress and talked about it with other friends in a WhatsApp chat. One of those guys didn't even look up the mattress anyone on the web but still got an ad for it on FB in a few hours. Could be just a coincidence. All of them are on Android.