Even more bizarre, because WhatsApp use phone numbers as ID, I see people exchanging phone numbers willy nilly!<p>For example a married woman that wanted to cheat on her husband that is not having relations with her, sent me a message with her phone number asking me to talk to her on WhatsApp (but at least remembered to ask me to not call her...).<p>I am not into that stuff, still, that was only ONE example, in that day, I joined a evangelical christian chat when I was bored, and there was there lots of old guys clearly looking for sex (they had nicknames like &quot;big cock 57&quot; while moderators were out), and I saw a girls younger than 16 posting in the open chat their &quot;watsapp&quot; numbers wanting to chat, probably without realizing this were their personal phone numbers.<p>Also I&#x27;ve seen people going to great lenghs to stay anonymous online and then exchanging whatsapp number without realizing you can use this to track their real name down (unless the person was conscious enough to create a fake ID when buying the phone number, something I doubt that most people do).