Which Social Media Platform Is Best for Marketing?

The best social media platform for marketing is the one your buyers already use for the kind of decision you want them to make. For most UK consumer businesses that means Facebook and Instagram first, with YouTube or TikTok for video. For B2B it is usually LinkedIn. Pick one main channel and one support channel, not five.

That answer sounds obvious, so this guide adds what most articles on the topic leave out: current UK audience figures from Ofcom, a scoring framework you can fill in for your own business in twenty minutes, and the trade-offs between organic posting and paid reach on each platform. The audience data comes from Ofcom’s Online Nation 2025 report, which uses May 2025 figures for UK adults online. We checked it in November 2026.

Key takeaways

• Reach is not the same as fit. YouTube and Facebook reach more than nine in ten UK online adults, but LinkedIn’s smaller audience is the one that lets you target by job title and company size.
• Time spent matters as much as reach. TikTok reaches fewer adults than Instagram, yet its visitors spend longer on it each day.
• Choose a main platform and a support platform. Most small teams cannot produce good work for more than two channels at once.
• Decide early whether you will pay for reach. Organic and paid social are different jobs with different budgets.
• Review your choice after 90 days using enquiries and sales, not followers.

Which social media platforms do UK adults actually use?

YouTube, Facebook (with Messenger) and Instagram are the three most used social and video platforms in the UK, according to Ofcom. Reddit and TikTok follow, with X, LinkedIn, Pinterest and Snapchat behind them.

The table below shows Ofcom’s figures for UK adults (18+) online in May 2025. “Monthly reach” is the share of UK online adults who visited in the month. “Daily time” is the average time per day for each visitor.

Source: Ofcom, Online Nation 2025, using Ipsos iris data for May 2025. Ofcom also reports that WhatsApp reached 90% of UK adults, which makes it the most used messaging app.

A few details from the same report change how you should read the table. X lost visitors, falling from 45% of online adults in May 2024 to 39% in May 2025. TikTok grew by 14% year on year, and its daily audience grew faster still. Pinterest has the strongest female skew of the top ten, with 69% of its visitors female. Snapchat has the youngest audience, with 66% of its users aged 18 to 34. Facebook and YouTube have the highest share of visitors aged 55 and over.

Why is the biggest platform not always the best one for marketing?

Because reach tells you who is there, not whether they will buy from you there. A platform earns its place when your buyers use it, the format suits what you sell, and you can reach them at a cost that pays back.

Take LinkedIn. It reaches fewer UK adults than Instagram, and the average visitor spends about two minutes a day on it. On reach and time alone it looks weak. But LinkedIn lets advertisers target by company name, industry, company size, job title, job function and seniority, using details members add to their own profiles. If you sell payroll software to finance directors at firms with 50 to 200 staff, that targeting is worth far more than raw reach.

The reverse is also true. A café or a beauty salon gains little from job-title targeting. It needs local people who are already scrolling, which points to Instagram and Facebook, with the shop’s Google Business Profile doing the work for people searching nearby.

Which platform suits which type of business?

Match the platform to how your customers buy, not to what is popular. This is how we usually map it at ProntX when a client asks where to start, and it is the first step in our social media planning for new clients.

• Local services and trades (plumbers, roofers, clinics, salons): Facebook for local reach, community groups and reviews; Instagram for before-and-after work. Consider WhatsApp Business for replies, since so many UK adults already use WhatsApp.
• Ecommerce and consumer products: Instagram and Facebook, run through Meta Ads Manager, for product ads and retargeting. Add TikTok if your product demonstrates well in short video and your buyers skew under 35. Add Pinterest for home, fashion, weddings and gifts, where people plan purchases ahead.
• B2B services and software: LinkedIn as the main channel, both company page and founder or staff profiles. YouTube as support for longer explainers and demos. Our LinkedIn work for B2B firms follows this pattern.
• Hospitality and events: Instagram and TikTok for atmosphere and short video, Facebook for events and an older local audience.
• Professional services aimed at consumers (solicitors, accountants, financial advisers): Facebook and YouTube for explainers that build trust, LinkedIn for referrals and recruitment. Anything that promotes financial products needs extra care with UK advertising rules.
• Brands aimed at under-25s: TikTok, Snapchat and YouTube. Instagram still matters, but Ofcom’s data shows where younger adults spend the most time.

Reddit is a special case. Ofcom notes its UK reach has grown fast and that it is heavily cited in AI search answers, but visitors spend only about four minutes a day there. It rewards genuine participation in relevant communities rather than promotion, so treat it as a listening and reputation channel unless you have a clear plan.

How do you choose the right platform for your business?

Score each candidate platform against five questions, add up the scores, and start with the top two. It takes about twenty minutes with a spreadsheet and keeps the decision about your customers rather than habit.

1. Audience fit (0 to 5). Do your best existing customers use this platform? Ask ten of them, or check which networks send traffic in GA4 under acquisition reports.
2. Format fit (0 to 5). Can you show what you sell in the platform’s main format? Visual products suit Instagram and Pinterest. Expertise suits LinkedIn and YouTube. Personality and process suit TikTok.
3. Buying stage (0 to 5). Will people here be ready to enquire, or only to notice you? Retargeting on Facebook and Instagram catches people close to buying. TikTok and YouTube are stronger for first contact.
4. Targeting you need (0 to 5). If you must reach a job title or company type, LinkedIn scores high. If you need a postcode radius, Meta Ads Manager scores high.
5. Capacity (0 to 5). Can you produce what this platform needs every week for six months? A platform you post on twice and abandon scores zero, however good it looks on paper.

Treat a total of 20 or more as a strong candidate and anything under 12 as one to ignore for now. The point is not precision. It is forcing an honest answer to question five, which is where most social plans fail.

Should you rely on organic posts or pay for reach?

Most businesses need both, but in different proportions per platform. Organic posting builds trust with people who already know you. Paid social reaches new people predictably and lets you target them.

On Facebook and Instagram, organic posts from a business page usually reach a small share of followers, so a modest ad budget does the heavy lifting for new customers. On LinkedIn, posts from real people tend to travel further than company page posts, so founders and senior staff posting their own views often beat paid content for credibility. TikTok can still put a new account’s video in front of strangers through its recommendation feed, but results vary widely from one video to the next.

If you plan to run ads, decide the monthly ad budget before you choose the platform. LinkedIn ads usually cost more per click than Meta ads, so a small budget can run out before you learn anything. Our paid social team usually tests one platform properly before splitting spend.

How many social media platforms should a small business be on?

Two is the right number for most small UK businesses: one main platform where you put most effort and budget, and one support platform where you reuse and adapt the same ideas.

Claim your business name on the others so nobody else takes it, add a link to your website, and leave them quiet. An empty profile with a clear “find us on Instagram” note does less harm than a feed that stopped in 2023.

A practical weekly rhythm for a two-platform plan looks like this:

• Three posts a week on the main platform, at least one of them video.
• Two posts a week on the support platform, adapted rather than copied.
• Fifteen minutes a day replying to comments and messages. Slow replies cost enquiries.
• One monthly review of what drove website visits and enquiries.

How do you know if you picked the right platform?

Judge the platform on the enquiries, sales or sign-ups it sends, measured over at least 90 days. Followers and likes tell you whether content is seen, not whether the channel is worth the time.

Before you start, tag every link you post with UTM parameters so GA4 records the platform and campaign. Set up conversion events for form submissions, calls from the website and purchases. Then compare cost per enquiry across channels, counting staff time as a cost. Our guide to measuring social media performance covers the setup in detail, and the social media strategy guide explains how to plan content once you have chosen.

Platform choice checklist

• You can name who your buyer is and roughly what age, job or location they have.
• You have checked UK usage data for that group rather than guessing.
• You have scored at least four platforms against the five questions above.
• You have picked one main platform and one support platform.
• You know whether you will run ads, and the monthly ad budget.
• You can produce content for both platforms every week for six months.
• GA4 conversion tracking and UTM tagging are in place before launch.
• You have a date, 90 days out, to review results and keep, change or drop a platform.

Where does ProntX fit in?

ProntX helps UK businesses choose their platforms, produce the content, run the ads and report on enquiries rather than vanity numbers. Our social media marketing starts from £650 a month ex VAT on a rolling monthly contract, and you keep ownership of every account and ad account. If you are unsure which two platforms deserve your time, the ProntX team can look at your audience and current channels as part of a free growth audit, delivered as a short personal video. Either way, start with the data above and the five-question score, and let your own customers settle the argument.