Chapter 3: Social Media and Online Identity

Post like it’s permanent, because it is

Social media can be a wonderful place: you can share art, follow your interests, keep up with family far away, and find people who love the same things you do. It can also be a place where rumors spread, privacy leaks, and people get hurt. The difference is mostly in how people use it.

In this chapter, you’ll look under the hood. You’ll learn what you actually agree to when you sign up, what kinds of data make up your footprint and what harm they can cause, how to protect your personal information and your friends’, how to be an upstander when someone is targeted, and how the design of feeds affects your mood and your time.

3.1 — Age Rules, Agreements, and Your Account 📜

Most major social media platforms, including Instagram, TikTok, Snapchat, and YouTube’s main app, require users to be at least 13 to create an account. That number isn’t random. A U.S. federal law called the Children’s Online Privacy Protection Act (COPPA) requires websites and apps to get verifiable permission from a parent before collecting personal information from children under 13. Rather than do that, many companies simply don’t allow under-13 accounts. Some features have even higher limits; TikTok, for example, requires users to be 18 to host a livestream.

If you are under 13, the right path is school-approved and family-approved tools, used with a teacher or parent. If you are 13 or older, the next step is understanding what you agree to.

What’s in the Fine Print?

Every platform has terms of service (often called ToS or terms of use) and a privacy policy. Hardly anyone reads them, but they are legal agreements. Some parts mainly protect you, and some mainly protect the company:

Provisions That Mainly Protect the User	Provisions That Mainly Protect the Provider
Community rules banning harassment, threats, and hate	Limits on the company’s legal responsibility if something goes wrong
Privacy controls and promises about how data is used	A license to use, display, and copy content you post
Ways to download or delete your data	The right to suspend or delete accounts
Reporting and appeal processes	The right to change the terms later, sometimes with little notice
Age limits and safety features for teens	Rules about how disputes are settled, which can limit your ability to sue

Notice the license row. On many platforms you keep ownership of your photos and videos, but you give the company permission to use them in many ways. That is one more reason to think before posting.

3.2 — Your Footprint: What Lasts and What It Can Cost 👣

In Chapter 1 you learned that your digital footprint has active and passive parts. On social media, both grow quickly. Let’s map where the data actually comes from.

Sources of Footprint Data

What you post: photos, videos, captions, comments, likes, reposts, bio, username.
What others post about you: tags, mentions, group photos, screenshots of your messages.
What platforms record: what you watch and for how long, who you follow, what you search, when and where you log in.
Device data: location, device type, contacts you may have allowed an app to access.
What others collect: advertisers and data broker companies, which gather information from many sources and combine it into profiles that are sold or shared.

Why “Delete” Isn’t the End

Deleting a post removes it from your profile, but copies may live on. Other people may have screenshots or downloads. Some sites archive public pages. Search engines can show older versions for a while. Platforms may keep deleted data on their servers for a period of time, as their privacy policies explain. This doesn’t mean deleting is useless; it lowers how many people will see something. It means the best protection is deciding carefully before you post.

Sorting the Harm

Not all persistent content is risky in the same way. Sorting it by the type of harm it could cause helps you decide what to share and what to clean up:

Type of Harm	What It Looks Like	Example
Reputation	Content that changes how schools, teams, or employers see you	A cruel comment that resurfaces years later
Safety	Content that helps a stranger find or approach you	A photo with your school name and a live location
Relationship	Content that hurts or embarrasses someone else	Posting a friend’s private message as a joke
Financial	Content that helps someone steal accounts or money	Pet’s name and birthday that match security questions
Legal	Content that breaks laws or rules	Sharing someone’s private images or threats

The same post can fall into more than one category. A screenshot of a group chat can damage reputation and relationships at once.

3.3 — Privacy and Personal Information 🔒

personally identifiable information (PII) is any information that can identify you, alone or combined with other details. Your full name is PII. So is your address, phone number, school, birthday, and face. Even small details can combine: a jersey number, a team name, and a town can be enough to figure out who and where someone is.

Risks and Benefits

Sharing PII is not always bad. It is a trade-off:

Who You Share With	Possible Benefit	Possible Risk
Organizations (school, doctor, a store)	Services, records, deliveries	Data breaches, data sold to others
Individuals (friends, online contacts)	Connection, making plans	Oversharing, screenshots, strangers pretending to be peers
Applications (games, social apps, AI tools)	Personalized features	Tracking, ads, data used to train systems, leaks

The key question is always: does the benefit justify the risk, and do I trust where it’s going?

Hidden PII

Some PII hides in plain sight. A geotag is location information attached to a photo or post. Many phones can store GPS data inside photo files, and many apps offer to tag your location. Backgrounds reveal more than you expect: your house number, your school logo, a street sign, a uniform.

Detect, Correct, Prevent

Detect: Check old posts, profile bios, and photos for PII. Look at the backgrounds.
Correct: Delete or edit posts that share too much. Ask friends to remove photos that show your PII. Use the platform’s tools to request removal of content about you.
Prevent: Turn off location sharing in apps that don’t need it. Set accounts to private. Use a nickname that doesn’t include your full name or birth year. Ask before tagging or posting anyone else.

Protecting privacy includes other people’s. Before posting a photo of a friend, ask. Before tagging someone, make sure they’re comfortable being included.

3.4 — Cyberbullying and Upstanders 🛡️

cyberbullying is using technology to harass, threaten, embarrass, or exclude someone, usually again and again. It can look like mean comments, fake accounts that mock a person, sharing embarrassing photos, spreading rumors in group chats, or deliberately leaving someone out and then talking about them.

Why It Hits So Hard

Cyberbullying has features that can make it feel worse than in-person bullying:

It follows you home. A phone in your pocket means there is no safe place to escape.
It has a huge audience. One post can be seen by the whole grade.
It’s permanent. Screenshots keep it alive after it’s deleted.
It can be anonymous. Not knowing who’s behind it can be frightening.

Students who are targeted may feel anxious, isolated, or ashamed, and may stop wanting to go to school. Raising awareness means helping people recognize these effects instead of brushing them off as “just drama.”

From Bystander to Upstander

Most cyberbullying has an audience. A bystander sees it and does nothing. An upstander sees it and takes safe action. You don’t have to confront anyone publicly to be an upstander:

Don’t add fuel. No likes, laughs, shares, or reposts.
Reach out privately. “That wasn’t okay. Are you alright?” can mean everything.
Report it using the platform’s tools.
Save evidence. Screenshots of what happened help adults act.
Tell a trusted adult. A teacher, counselor, or parent can do things you can’t.

Preventing It Before It Starts

Strategies that work at the class and school level include agreeing on group chat norms (see 2.3), making it normal to say “not cool” when a joke goes too far, posting clear reporting steps, and creating anonymous reporting options. All U.S. states have anti-bullying laws, and most specifically address electronic or cyberbullying, which means schools are expected to have a plan. You can help make that plan real.

If you are the one being targeted: don’t respond to the bully, block and report them, save the evidence, and tell an adult you trust. It is not your fault, and you don’t have to handle it alone.

3.5 — Likes, Feeds, and Your Well-Being ❤️

Social media feeds aren’t random. An algorithm decides what you see, mostly based on what keeps you watching. If you pause on a video, the system learns and sends more like it. That can be great when it shows you new art techniques. It can be harmful when it keeps feeding you content that makes you feel bad about yourself.

The Pressure of Numbers

Likes, views, streaks, and follower counts are designed to be motivating. They also make it easy to start measuring your worth in numbers. Some people post riskier or meaner content because it gets more attention. Others feel anxious when a post doesn’t do well. Remember that a like count measures what an algorithm showed to people, not how valuable you or your ideas are.

Being Intentional

Healthy use is not about never using social media. It is about being in charge of it:

Notice how you feel. After scrolling, do you feel inspired, or worse? That’s data.
Curate your feed. Unfollow or mute accounts that make you feel bad. Follow ones that teach or inspire you.
Set limits. Built-in screen time tools can remind you when you’ve hit a limit you chose.
Protect sleep. Phones out of the bedroom at night is one of the simplest, most effective habits.
Hide counts if your platform allows it.

Comparison and Filters

Feeds are full of highlight reels: the best photos, the best moments, often edited or filtered. Comparing your everyday life to everyone else’s best moments is a losing game. Filters and editing apps can change faces and bodies in ways that look natural but aren’t, and AI tools now make that even easier. When you catch yourself comparing, remind yourself that you’re seeing a carefully chosen slice, not the whole story.

Respect for Others

Your choices shape other people’s feeds too. When you like or share mean content, you teach the algorithm to spread it. When you share something kind or useful, you help it spread instead. That’s netiquette at the scale of a whole platform.

Chapter 3 Activity: Lab: Footprint Forensics 🔎

Your Mission: Investigate fictional social media profiles like a digital detective, then design a plan to prevent the problems you find. Use teacher-provided profiles only.

Part 1: Hypothesis

Predict: “Most public profiles reveal at least ___ pieces of personally identifiable information.” Explain your guess.

Part 2: The Investigation

Examine three fictional profiles from your teacher. For each, list every piece of PII you can find, including hidden ones in photo backgrounds and captions. Count them and compare to your hypothesis.

Part 3: Sort the Harm

For each profile, choose the three riskiest posts and sort them into the harm categories from 3.2 (reputation, safety, relationship, financial, legal). Then write a detect, correct, and prevent step for each.

Part 4: The Upstander Campaign

One profile includes comments targeting another student. Plan a short awareness campaign for your school: a poster, a 30-second announcement script, or a set of group chat norms. It must explain the effects of cyberbullying and give at least three concrete upstander actions.

Key Concepts Checklist

I can explain why most social apps require users to be 13 and what COPPA does
I can identify terms of service provisions that protect users and ones that protect the company
I can list five sources of data in a digital footprint
I can sort persistent online content by the type of harm it could cause
I can weigh the risks and benefits of sharing PII with organizations, people, and apps
I can detect, correct, and prevent oversharing, including geotags
I can explain the effects of cyberbullying and list five upstander actions
I can explain how algorithms shape feeds and name ways to use social media intentionally