Facebook or Instagram for Your Business Audience.

Pick the app by who signs off the purchase, not by which one feels current in the office.

That rule settles most of these arguments, because the instinct in the room is usually wrong in both directions. Facebook is not a retirement home, and Instagram is not where the entire market moved.

Pew Research Centre’s social media fact sheet puts Facebook’s strongest age band at 30 to 49, where 80% of US adults say they use it. Instagram runs the other way, reaching 80% of 18 to 29 year olds and 19% of the over 65s.

So the real question is not which app is winning. It is which app holds the attention of the people who can say yes to you, and whether your team can run one properly before it tries to run two badly.

The reflex that gets this wrong

Somebody says Facebook is where your mum posts birthday photos. Somebody else says Instagram is where the customers went. Both are describing their own feed, not the market.

That reflex has a price. Every hour spent on the wrong app is an hour not spent on the one your buyer actually opens, and most marketing teams have only enough capacity to do one thing well.

The fix is not a better opinion. It is treating channel choice as an operations decision with inputs you can check.

What the age data actually says

Pew Research Centre asks US adults which platforms they ever use. The pattern is stable and it is not the one most people expect.

Facebook, by age band:

• 18 to 29: 68%
• 30 to 49: 80%
• 50 to 64: 74%
• 65 and over: 57%

Instagram, by age band:

• 18 to 29: 80%
• 30 to 49: 62%
• 50 to 64: 40%
• 65 and over: 19%

Facebook peaks in the middle of working life. Instagram drops sharply after 50 and is close to absent above 65.

These are US adults, so treat the figures as the shape of the pattern rather than as your own numbers.

The UK picture is close, but not identical

Ofcom’s Adults’ Media Use and Attitudes research covers UK adults aged 16 and over. It puts Facebook at 76% of adult internet users and Instagram at 57%.

The age split runs the same direction. Instagram reaches 86% of 16 to 24 year olds and 21% of the over 65s. Facebook reaches 66% of the over 65s and, against the office stereotype, only 64% of 16 to 24 year olds, which is below its own average.

A UK marketing lead should not import US percentages and call that a plan. Use both sets to establish the direction of travel, then check your own audience.

Reach is not attention

Reach tells you who has an account. It does not tell you where a person spends their evening, and the gap between those two things is where channel decisions go wrong.

Ofcom also asks which platform people call their main one. Facebook takes 48% of UK social media users overall, rising to 77% among the over 65s and falling to 9% among 16 to 24 year olds. Instagram is the most common answer among 25 to 34 year olds, at 34%.

Read together, that says Facebook has the broader reach across nearly every age while its share of primary attention leans oldest. Instagram has narrower reach with a much younger centre of gravity.

Step 1: Name the person who signs off

Write down who approves the purchase. Not the end user, not the person who mentions you in a meeting. The one whose signature moves money.

If that person is in their forties, skipping Facebook is an expensive reflex. If your product is bought by people in their early twenties, the same reflex is correct for the opposite reason.

Where the buyer and the influencer are different people, write down both, then decide which one your finite effort is aimed at.

Step 2: Read your own numbers before anyone else’s

National research sets the prior. Your own data sets the answer.

Three places to look, strongest evidence first:

• Your customer list or CRM, which shows who actually buys rather than who follows
• The age breakdown in your own Facebook and Instagram account insights, if you already post on both
• Your website analytics, for the age profile of people arriving with intent

When national research and your own customer data disagree, back your own data. You sell to your market, not to a national average.

Step 3: Match the job to what each app is good at

Age is one input. The other is what you need social to do, because the two apps reward different work.

Facebook is stronger for community and repeat contact: groups, events, local discovery, longer comment threads, and posts that keep circulating past their first day.

Instagram is stronger for identity and for reaching people who do not follow you yet: Reels distribution, visual consistency, creator collaboration and conversation that happens in DMs.

Neither is a general purpose answer. One is a room you host. The other is a window strangers walk past.

Step 4: Choose what you can sustain

Capacity decides more channel strategies than audience data does, and almost nobody writes it down.

Ask what your team can genuinely ship every week without quality falling over: how many pieces, at what standard, through what approval path. Then pick the number of channels that fits that answer rather than the number that fits the ambition.

One account run properly beats two run at half strength. A neglected second account tells a visitor you gave up.

When running both is genuinely worth it

Both apps earn their place when:

• Your buyers span both age profiles, for example a family product where the parent pays and the teenager chooses
• You already make video that can be cut for Reels and posted natively to Facebook without a second production run
• Each app is doing a different job, such as events and community against brand and discovery
• You have the capacity to give the second account a real cadence rather than an occasional repost

Where both are worth running, they should run as one operation with a shared plan, not two calendars that happen to share a logo. That is how NBK approaches Facebook and Instagram as a single system.

When running both is a distraction

Two accounts are a mistake when:

• The second one exists because a competitor has one
• Its content is the same post cropped, with no thought about how each feed behaves
• Nobody owns it, so it publishes whenever someone remembers
• Your buyer is clearly concentrated in one age band and the second account chases people who will never sign anything

The tell is simple. If you cannot say what the second account is for in one sentence, it does not have a job.

What good looks like

One primary app with a named owner, a real weekly cadence, and a content plan built for how that feed actually behaves.

One secondary app, if you have earned it, with an explicit lower bar, a stated job and a metric that matches the job. A community account should not be judged on follower growth.

A review point in the diary, quarterly is enough, where you look at the age data again and ask whether the split still matches who is buying.

How NBK thinks about choosing between the two

Most brands asking this question do not have a platform problem. They have a capacity problem wearing a platform costume.

NBK starts with the system: who the audience really is, what the team can ship, how approvals move, and what each channel is being asked to deliver. The platform choice falls out of that, and it changes when the evidence changes.

It is also why the answer is never to buy your way past the question. Reach on either app is earned by understanding how the feed behaves and building an operating rhythm to match, and that rhythm is what carries across both.

Next step

Choose one app, name its owner, and give it a proper run of weeks before you judge it.

If you are not sure which one that should be, or you suspect you are running two accounts that each hold the other back, start by auditing what you already have. The social media audit checklist walks through the same questions NBK asks at the start of a strategy engagement.

If your social output feels busy but not effective, the constraint is usually the system, not the app.