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In many apps, like Facebook or WhatsApp, you cannot see online status of others if you hide yours (WhatsApp) or disable chat (Facebook website/Messenger).

Why and how this should be considered a security measure?

1 Answer 1

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It's not, it's merely a fair use policy/scenario. You get a privacy benefit (seeming to be offline), but you have to pay a price (not knowing when others are online). Technically, they could tell you when others are online when you're invisible (like how skype does it), but Facebook/Whatsapp chooses not to.

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