Cyber Explorer Skills · lesson 9 of 16 · 15 min
Privacy detective
A privacy detective looks carefully at situations to find hidden privacy risks — things that might seem harmless but could actually reveal personal information. Privacy risks are not always obvious. Sometimes a single post, photo, or piece of information seems innocent on its own, but combined with other details, it can reveal a lot about you.
In this lesson, you will practice thinking like a privacy detective. The key question to ask about every piece of information you share online is: “What could someone learn from this?”
Privacy detective mindset: Ask “What could someone learn from this?” about every piece of information you share online. Even small details can add up to reveal a lot about you — your location, your routine, your school, and more.
How small details add up
Example: What a stranger could learn from these three posts:
- “Just finished soccer practice at Lincoln Elementary!”
- School name and location
- “Home by 5pm every Tuesday after practice 🏠”
- Predictable routine and home arrival time
- “My team photo in front of the school sign! 📸”
- Confirms school, shows face
Combined, a stranger now knows: your school, your face, where you are every Tuesday at 5pm, and when you arrive home.
Privacy detective tips
- Before posting, ask: “What could someone learn from this?”
- Check photos for street signs, house numbers, school names, or location tags.
- Be careful about sharing your routine — when you leave, when you arrive home, where you go regularly.
- Think about what multiple posts together might reveal, not just each one alone.
- When in doubt, ask a trusted adult before posting.
Key words to remember
- Privacy detective
- Information aggregation
- Routine
- Location data
- Metadata
Match each privacy detective concept to its description
Privacy detective — quiz
A student posts: “Just finished soccer practice at Lincoln Elementary! Home by 5pm every Tuesday.” What privacy risk does this create?
- None — it is just a schedule
- It reveals their school, location, and predictable routine to strangers
- It might upset their soccer coach
- It uses too many characters
Answer: It reveals their school, location, and predictable routine to strangers
This post tells strangers exactly where the student is, when, and where they go to school.
A photo shows a student in front of their house. The street sign and house number are visible. What should they do before posting?
- Post it — it is a nice photo
- Crop out the street sign and house number, or choose a different photo
- Add a filter to make it look better
- Tag their location in the post
Answer: Crop out the street sign and house number, or choose a different photo
Street signs and house numbers reveal your home address. Remove them before posting.
An app asks for your birthday to “personalize your experience.” What should you think about?
- Give your real birthday — it is just for fun
- Consider whether the app really needs your birthday and ask a trusted adult
- Give a fake birthday
- Uninstall the app immediately
Answer: Consider whether the app really needs your birthday and ask a trusted adult
Think about why an app needs personal information and check with a trusted adult before sharing.
What is information aggregation?
- Deleting your personal information
- Combining multiple small pieces of information to build a detailed picture of someone
- A type of privacy setting
- Sharing information with trusted adults
Answer: Combining multiple small pieces of information to build a detailed picture of someone
Small details that seem harmless alone can reveal a lot when combined.
A single post that seems harmless can still be a privacy risk when combined with other posts.
- True
- False
Answer: True
Information aggregation means multiple small details can combine to reveal much more than any single post.
What is metadata in a photo?
- The caption you write
- Hidden information like GPS coordinates embedded in the photo file
- The filter you applied
- The number of likes it gets
Answer: Hidden information like GPS coordinates embedded in the photo file
Photos can contain hidden metadata including GPS location — this can reveal exactly where you took the photo.
What is the key question a privacy detective asks before sharing anything online?
- “Will this get a lot of likes?”
- “What could someone learn from this?”
- “Is this a good photo?”
- “How many people will see this?”
Answer: “What could someone learn from this?”
Asking “What could someone learn from this?” helps you identify hidden privacy risks before posting.
Sharing your daily routine online can be a privacy risk.
- True
- False
Answer: True
A predictable routine tells strangers when and where you will be — this is a safety risk.
Which of these is a hidden privacy risk in a photo?
- The color of your shirt
- A street sign visible in the background
- The time of day
- The number of people in the photo
Answer: A street sign visible in the background
Street signs in photos can reveal your location or home address to strangers.
What should you do when you are not sure if a post reveals too much personal information?
- Post it anyway
- Ask a trusted adult before posting
- Post it with a privacy setting
- Ask friends online if it is safe
Answer: Ask a trusted adult before posting
When in doubt, always check with a trusted adult before sharing anything that might reveal personal information.
Try it: Privacy detective
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