What Not to Share on Social Media (and Why)

A photo of a boarding pass posted to Facebook can hand a stranger your full name, booking reference and frequent-flyer number, all of which sit in the barcode. Social media feels private because you are sitting at home, but most posts are visible to far more people than the friends you picture. Knowing the handful of things never to share keeps you connected without leaving a door open.

The risk is not that someone wants your holiday snaps. The risk is that small, ordinary details add up. A birthday here, a pet's name there, the street you grew up on, and a scammer has the exact answers to the security questions your bank uses. The list below covers what to hold back and the plain reason for each.

Your home address and daily routine

Never post your full address, and be careful with anything that points to it: the front of your house, your street sign, the view from your window, or a parcel label with the address showing. Burglars do watch public posts, and a clear photo of your front door tells them what locks you have.

Routine is just as revealing as an address. Posts like "off to the gym every morning at seven" or "the dog walk takes an hour" quietly tell a stranger when your home is empty. You do not have to stop sharing your life. Share it after the fact, so the pattern of your day stays private.

That you are away from home right now

Holiday photos posted while you are still away are an open invitation. They announce that the house is empty and tell anyone watching roughly how long it will stay that way. The simple fix is to post the photos once you are home, when the same pictures carry none of the risk.

This applies to small absences too, not just two-week trips. "At the hospital with Mum all day" or "weekend away with the grandchildren" both signal an empty house. Enjoy the moment in private and tell the story afterwards.

Personal details that answer security questions

Banks and email providers often verify you with questions like your mother's maiden name, your first pet, your first car or the town you were born in. Those exact answers turn up constantly in social media games and quizzes: "your first pet plus your street name is your superhero name". Filling one in is fun, and it hands over the keys.

The table below shows how an innocent post lines up with a real security question. Once you see the pattern, the popular "get to know me" tag posts look quite different.

Photos of documents, cards and tickets

A proud post of a new bank card, a driving licence, a passport page or a vaccination certificate gives away numbers that should stay private. Boarding passes and event tickets are worse than they look, because the barcode holds booking and personal information that an ordinary phone can scan and read.

If you want to share good news, photograph it without the sensitive part, or cover the numbers first. The same goes for a screenshot of an email or message that shows an address, a phone number or an account number in the corner. Crop it out before it goes anywhere public.

One detail people overlook is the background of an ordinary photo. A snap of the grandchildren on the sofa might also show post on the table with your name and address, a calendar with your plans, or a bank letter on the side. Glance at the whole frame, not just the faces, before you share it. A quick look saves a private detail from slipping out by accident.

Your phone number and email in public posts

Posting your phone number or email in a public comment, even to help someone, scatters it where automated programs harvest contact details for spam and scam calls. If you need to share a number with one person, send it in a private message instead of a public reply.

This matters more than it used to, because scam calls and texts increasingly target people by name. A number paired with your name and town gives a caller enough to sound convincing. Keep direct contact details for private channels.

The same care applies to public groups and marketplace listings. Selling an item locally feels harmless, but a listing that shows your phone number, a clear photo of your home and a rough location gives a stranger a lot to work with. Use the messaging built into the marketplace app rather than posting your number, and meet buyers in a public place.

Other people's information without asking

Posting photos of grandchildren, naming the school they attend, or sharing a friend's news before they have is a quiet privacy leak that is easy to make by accident. The people in your photos may have good reasons to keep their image or whereabouts off public feeds.

A short habit fixes it: ask before posting a recognisable photo of someone else, and never name a child's school or club in a public post. If a relative asks you to take a picture down, do it without taking offence. You would want the same courtesy.

Financial details and big purchases

Announcing a new car, a home renovation, a pension lump sum or a lottery win paints a target on your back. It tells strangers you have money to take and, in the case of a renovation, that workers and deliveries are coming and going from your home. Scammers read these posts and tailor their approach, sometimes phoning to "confirm" a delivery you really are expecting.

The same caution applies to complaining publicly about a bank, an investment or a bill. Fraudsters watch for people frustrated with a company, then contact them pretending to be that company's support team. They already know your grievance, which makes them sound believable. Take money complaints to the company privately, using the phone number on the back of your card or the contact page on the company's own website, not to a public timeline where anyone can read them.

Live video and "check-in" features

Live video and the "check-in" button broadcast exactly where you are at this moment, which is the one piece of information a burglar most wants. A check-in at a restaurant across town is a polite way of telling everyone your home is unattended. The convenience is small and the exposure is large.

If you love sharing where you have been, do it as a memory rather than a live update. Post the restaurant photo on the way home or the next morning. The meal looks just as good a day late, and nobody learns your house was empty while you were out. The same goes for the live broadcast of a family event such as a christening or a party, which tells the world your whole household is in one place and away from home.

A simple test before you post

Before you tap share, ask one question: would I be comfortable putting this on a noticeboard in the supermarket with my name on it? If the answer is no, the post probably reveals more than you want. This single check catches most of the mistakes on this page without any technical knowledge.

Staying safe online is not about fear or about leaving the apps your family uses to keep in touch. It is about a few steady habits: post the trip after you return, keep documents and personal trivia offline, and check your privacy settings once a year. Those small choices let you share the good parts of your life while keeping the keys to your accounts firmly in your own pocket.