Paid social media advertising: how it works for small firms

Paid social media advertising means paying a platform such as Facebook, Instagram or LinkedIn to show your ads to an audience you choose, rather than only to people who already follow you. You set an objective, an audience and a budget. The platform runs an auction and charges you for impressions, clicks or another action.

This guide explains how paid social differs from organic posting, how the platforms decide what you pay, how to choose an audience, how to test creative and pace a budget, and when ads make sense for a small company. Every platform rule below links to the platform’s own documentation. Rules change, so check the current page before you rely on one.

Paid social versus organic

Organic posts are free to publish and reach your followers and the people they share with. Paid social buys reach beyond them.

	Organic	Paid
Cost	Your time	Your time plus ad spend
Who sees it	Mostly followers and their networks	The audience you target
Speed	Builds over months	Starts as soon as the ad begins delivering
Control	Little: the platform decides who sees a post	Objective, audience, budget and schedule are yours to set
When it stops	Posts keep working slowly	Reach stops when spending stops

The two work best together. Organic posts tell you which messages people respond to, at no cost; paid social puts the proven ones in front of more of the right people. If you do not have an organic rhythm yet, our guide to social media content ideas is the place to start.

How paid social media advertising charges you

Two decisions set what you pay: the auction, which decides whether your ad is shown and at what price, and the billing model, which decides which event you are charged for.

The auction

Ad space on social platforms is sold by auction, ad by ad. You are competing with other advertisers who want the same person’s attention at the same moment.

• LinkedIn says on its pricing page that your costs are based on the type of activity you pay for and the ad auction, and that the cost to win depends on your bid and on how desirable your target audience is.
• Meta (Facebook and Instagram) says in its bidding documentation that it evaluates your bid strategy, your bid amount and the probability of getting the result you optimise for.

Our reading of both: a narrow, sought-after audience costs more to reach than a broad one, and the bid is not the only thing that counts, so an ad people are likely to act on can win more often than its bid alone would suggest.

What you are charged for

Each platform charges for an event: an impression (the ad was shown), a click, or another action. Which events you can choose depends on the campaign objective and the bidding strategy.

On Meta, the billing event is the event you pay for, such as impressions, clicks or other actions. Meta’s Marketing API documentation lists impressions, link clicks and video views among the billing events for auction campaigns.

On LinkedIn, the pricing page says pricing is set by objective: what you are charged for depends on the campaign objective, and you are only charged when that objective’s billable event occurs. LinkedIn’s help page on bidding strategies describes three:

LinkedIn bidding strategy	How it works	What you are charged for
Maximum delivery (automated)	LinkedIn bids for you and aims to spend your whole budget	Impressions (CPM), with no option to set a bid or a cost cap
Cost cap	You set a cost per key result, which LinkedIn uses as a benchmark when it sets bids	Impressions
Manual bidding	You set the amount you are willing to bid for a key result	Depending on the objective and format: impressions, landing page clicks, engagement clicks, sends or video views

CPM means cost per thousand impressions; CPC, cost per click. For a small budget, being charged per click on a manual bid gives you the most predictable cost per visit, while the automated strategies leave the bidding to the platform. Whichever you choose, judge it on cost per enquiry or sale, not on cost per click.

Audiences

Targeting is where paid social differs most from other advertising. There are three kinds of audience, and most small advertisers use all three over time.

People described by their traits

You describe who you want, and the platform finds them. LinkedIn’s targeting best practices show the business options it offers:

• job titles, including current and past holders of a title;
• job functions combined with seniority, to reach decision-makers in a field;
• member skills, when job titles are too narrow;
• company names, up to 200 of them, or company industries, where only a company’s primary industry on its LinkedIn Page counts;
• location, which is required for every LinkedIn audience.

Start broader than feels comfortable. LinkedIn itself advises against limiting an audience to a few job titles.

People who already know you

These are your own contacts, customers and site visitors. LinkedIn calls them Matched Audiences, and its targeting page says you can upload a list of up to 300,000 companies. Meta lets you build Custom Audiences, including from your website and mobile app, as its Lookalike Audiences documentation notes. They are usually the cheapest people to convert, because they have already shown interest. Use only contacts who agreed to hear from you, and follow the privacy law that applies to you.

People similar to your customers

A lookalike audience starts from a “seed”, such as an existing audience, and the platform finds people who resemble it. Meta’s documentation says seeds can be Custom Audiences, campaign or ad set conversions, or Page fans; that a Custom Audience needs at least 100 people to serve as a seed; and that you can set the lookalike to the top 1% to 20% of the audience in a chosen country. Because the setting takes the top share of people, a smaller percentage should mean a closer match; that is our inference from the documentation, not its wording.

Creative and testing

The ad itself, its image or video, its first line and its offer, usually matters more than any targeting setting.

• Make it fit the place. An ad that looks like a normal post on that platform, in the right shape for the feed or the story, does better than a reused print ad.
• Say one thing. One offer, one benefit, one call to action.
• Match the landing page. The page the ad links to should repeat the ad’s promise in the same words and make the next step obvious.
• Test one change at a time. Run two versions that differ in one element (the image, the first line, or the offer) to the same audience, with the same budget, for the same period. If you change three things at once, you will not know which one made the difference.
• Decide the winner by the result you want. The version with more clicks is not the winner if the other one brings more enquiries.
• Refresh before it tires. When results slip for an ad that used to work, try a new image or angle on the same offer before you change the offer itself.

Budget pacing

Pacing is how the platform spreads your budget over time. The two common settings work differently.

• Daily budget. Meta’s budgets documentation describes it as the average amount you are willing to spend each day, and says that on days with better opportunities it may spend more than the daily budget. LinkedIn also describes a daily budget as the average amount you would like to spend per day.
• Lifetime budget. On Meta, it is the amount you are willing to spend over the whole run of an ad set or campaign, and you will not be charged more than it unless you change your delivery settings. Spending can vary from day to day within that total.

For a small company, a lifetime budget on a campaign with a fixed end date is the easiest to control: you know the most you can spend before you start. Three rules keep pacing honest:

1. Fix a test period and a test budget in advance, long enough for the ads to deliver and for enquiries to come in.
2. Write down what counts as success (an enquiry, a booking, a sale) and the most you would pay for one.
3. Do not change the campaign every day. Small daily edits make the results impossible to read.

When paid social fits a small company

Paid social is worth testing when most of these are true:

• you have a clear offer that you can state in one line;
• you know roughly what a new customer is worth to you, so you know what you can pay to win one;
• you have a landing page or booking route that works on a phone;
• you can measure enquiries or sales, not only clicks;
• your organic posts already show which messages people respond to;
• your customers can be described by traits a platform can target, such as location, job or company.

It is usually too early if you have no website to send people to, cannot tell where customers come from, or have no offer beyond “find out more”. Fix those first; ads only amplify what is already there. If your buyers already search for what you sell, our guide to PPC lead generation shows how search ads turn that intent into enquiries.

A first campaign, step by step

1. Pick one objective: leads, website visits or sales, not all three.
2. Pick one platform where your customers are: LinkedIn for business buyers by job or company; Meta for consumers and local audiences.
3. Build one audience, broad enough to deliver, plus a second of people who already know you.
4. Make two ad versions that differ in one element.
5. Set a lifetime budget and an end date.
6. Track the result on your site or in your booking tool, and ask new customers where they heard of you.
7. Review at the end, keep the better ad, and change one thing for the next round.

Frequently asked questions

How much does paid social media advertising cost?

You set the budget. What each impression or click costs comes from the auction and depends on your bid, your objective and how sought-after your audience is, so we cannot give a fixed price. Start with a test budget you can afford to lose, and judge it on cost per enquiry.

What is the difference between organic and paid social?

Organic posts are free and reach mostly your followers. Paid ads cost money and reach an audience you choose, as long as you keep paying.

Which platform is best for paid social?

The one your customers use. LinkedIn suits selling to businesses by job title or company; Meta’s Facebook and Instagram suit consumer and local audiences.

How do platforms charge for social ads?

By an event chosen with the campaign: impressions (CPM), clicks (CPC) or another action such as a video view, with the price set by an auction.

Do I need an agency for paid social?

Not to start. A small test run by you will teach you a lot. When you want ads, landing pages and reporting run together with your other channels, see our digital marketing service.