Apple's Journal App Shares Some Data By Default to Improve Suggestions
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Apple's Journal app has a "Discoverable by Others" setting enabled by default. It allows nearby devices to detect your presence to improve their suggestions.
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The setting does not share your name or location. It uses Bluetooth to detect nearby devices in your contacts, without specifics.
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Apple says it's on by default so all users get benefit from suggestions, even if their contacts don't use Journal.
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The setting makes suggestions based on special events with groups of contacts present, not just average nights at home.
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You can disable "Discoverable by Others" in Privacy & Security settings for Journaling Suggestions.