Like it or not, WhatsApp is one of the most popular messaging applications out there, and billions around the world use it. Unfortunately, for a tool that's integral to communication for such a large audience, security is far from airtight. It was recently discovered that anyone could suspend someone's WhatsApp account by just knowing their number. Now, another research report sheds light on a staple feature that's being exploited by several apps and services to reveal the targeted user's app behavior.

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