The Social Media Ad Auction: What Businesses Should Know Before Spending Money On Ads

A business can spend £50 boosting an Instagram post, put £500 behind a Facebook campaign or invest in LinkedIn advertising. Each option offers a way to reach potential customers beyond an existing following, from local shoppers to professionals looking for specialist services.

Paid social gives businesses a way to promote products, introduce their brands and reach new audiences. Understanding how boosting works, how platforms choose ads and which numbers to watch can help businesses make informed decisions about their marketing budgets.

Boosting A Post Or Building An Ad Campaign?

Boosting is a simple way to promote existing content. Businesses can pay to extend the reach of a Facebook or Instagram post, choose an audience and set a budget. TikTok’s Promote tool offers similar options for increasing the exposure of videos and LIVE content.

A bakery sharing a video of a new cake, for example, could promote it to people in the surrounding area. It’s a practical way to introduce a product to potential customers without creating an entirely new advert.

For more control, Meta Ads Manager, TikTok Ads Manager and LinkedIn Campaign Manager offer options for selecting campaign objectives, audiences and placements. These tools also allow businesses to test different creatives and compare results. Boosting offers a quick entry point, while campaign managers provide more scope for structured testing.

How The Ad Auction Works

Social media platforms use automated auctions to determine which ads appear when advertising opportunities become available. Advertisers compete for placements, but the highest bid doesn’t automatically win.

According to Meta’s advertising guidance, its auction considers an advertiser’s bid, the estimated likelihood of someone taking the desired action and ad quality. TikTok’s bidding guidance identifies bid price and relevance as factors in its auction, while LinkedIn says bid price and relevance to the member viewing the ad influence which advertisements appear.

This gives smaller businesses a chance to compete for placements without matching the budgets of major brands. Their ads still need competitive bids and suitable targeting, and no approach guarantees a winning placement.

Competition for an audience can affect costs. A company targeting senior executives is competing for a different audience from a café promoting its lunch menu locally. Businesses can use audience settings to focus their spending on the people they’re trying to reach.

Which Numbers Should Businesses Watch?

Advertising dashboards offer plenty of figures, but three metrics help businesses evaluate their spending. CPM, or cost per thousand impressions, measures the cost of displaying an advert 1 000 times. CPC measures the average cost per click, while CPA measures the cost of generating a defined outcome, such as a purchase or lead.

These metrics answer different questions. CPM helps assess the cost of visibility, CPC measures the cost of attracting clicks and CPA connects spending to conversions.

Imagine two online shops paying £1 per website click. One has clear pricing, visible delivery charges and a quick checkout. The other hides delivery costs until the final step, by which point a customer might abandon their basket. Both have paid for the click, but their sales results could look very different.

Conversion tracking helps businesses connect advertising activity with actions on their websites. TikTok’s advertising documentation describes conversions as valuable actions, such as purchases or sign-ups. Tracking these outcomes helps businesses assess which campaigns generate results.

Making The Budget Go Further

Before launching a campaign, businesses should decide whether they want to build awareness, attract website visitors, generate leads or make sales. The chosen objective guides how the platform optimises ad delivery.

Creative testing gives marketers evidence to work with. A skincare brand could compare a product demonstration with a customer testimonial, for example, and measure the response to each. That beats leaving the decision to whoever in the office happens to like one video more than the other.

Setting a spending limit and defining what counts as a successful test gives a campaign clear boundaries. Businesses can review performance and adjust their investment using the results.

The website deserves attention as well – clear calls to action, mobile-friendly pages and a simple checkout give visitors a clearer route to purchase. There’s little point paying to bring people to a website that makes buying feel like an escape room.

Giving Paid Social A Place In The Marketing Mix

Organic content helps businesses build a recognisable presence, while paid promotion can introduce their posts and products to wider audiences. Together, they offer ways to promote offers, test messages and reach people who haven’t encountered the brand before.

A modest promotion can give a business an initial advertising test and campaign reporting then helps it assess whether the investment is producing the outcomes it set out to achieve.

Before increasing the budget, businesses should look at which adverts bring in customers, how much those customers cost to acquire and whether the resulting revenue justifies the spend. Social media platforms offer access to potential customers; turning that attention into business – which is obviously the part worth paying for.