Paid Social Advertising Explained: How Facebook, Instagram, and TikTok Ads Work for Brands

Paid social advertising means paying a platform, Facebook, Instagram, or TikTok, to show your content to people who haven't already chosen to follow you. Unlike organic posts, which only reach your existing audience (and even then, only a fraction of them), paid ads let you put your brand in front of a specific group of people based on who they are, what they're interested in, and how they've already behaved online. For business owners who've never run a paid campaign, the first question is usually the same: where does my money actually go? The short answer is that you bid for ad placements, and the platform's algorithm decides which users see your ad based on your budget, your targeting settings, and how relevant your ad appears to each user. You only pay when someone sees the ad (or clicks it, depending on how you set up the campaign). Facebook runs on Meta's Ads Manager, and its main strength is audience precision. You can target people by age, location, income range, life events (a recent engagement, a new baby), job title, and a long list of interests. Facebook also lets you build Custom Audiences from your existing customer data, and Lookalike Audiences that find new users who resemble your best customers. It works well for businesses with a defined customer profile and a product that benefits from a little explanation before purchase. Instagram shares the same Meta Ads Manager as Facebook, so the targeting options are identical. The difference is the environment. Instagram is a visual platform, and ads that feel native to the feed or Stories tend to perform better than anything that looks like a banner ad lifted from another channel. Brands with strong imagery, for example a skincare product or a food business, tend to see good results here. TikTok works differently. Its algorithm is less about who a user is and more about what content they engage with. TikTok's ad system will find your audience for you based on how people respond to your creative. That means the creative itself, the video, carries more weight on TikTok than on any other platform. Short, authentic-looking content tends to outperform polished production. It also skews toward a younger demographic, though that gap is narrowing as the platform matures. Across all three platforms, targeting generally falls into a few categories: Demographic targeting: age, gender, location, language Interest and behaviour targeting: users who follow certain pages, have purchased similar products, or have shown interest in related topics Retargeting: ads shown to people who've already visited your website, watched your videos, or interacted with your profile Lookalike audiences: the platform finds new users who share traits with your existing customers Retargeting is often the highest-performing category because you're reaching people who already know you exist. Someone who visited your product page but didn't buy is a much warmer prospect than a cold audience seeing your brand for the first time. The metrics that matter depend on your goal. A campaign built to drive online purchases should be judged on cost per purchase and return on ad spend (ROAS). A campaign built to generate enquiries should be judged on cost per lead. Vanity metrics like impressions and reach tell you how many people saw your ad, but they don't tell you whether any of them did what you needed them to do. A few numbers worth tracking from the start: Click-through rate (CTR): the percentage of people who saw your ad and clicked it. Low CTR usually means the creative or the headline isn't landing. Cost per click (CPC): how much you're paying each time someone clicks. This varies a lot by industry and audience size. Conversion rate: of people who clicked, how many completed the action you wanted. If CTR is high but conversions are low, the problem is usually on the landing page, not the ad. ROAS: for e-commerce, this is your most direct measure of whether the spend is justified. Most campaigns need at least a few weeks of data before you can draw firm conclusions. Changing targeting or creative too quickly is one of the most common mistakes brands make early on. Running paid social well takes time: writing copy, designing creative, testing audiences, reading the data, and adjusting. Many business owners find that after a few weeks of managing it themselves, the learning curve is steeper than expected and the results are harder to interpret than the platform dashboards suggest. Nova is a Manchester-based social media marketing agency founded in 2011, with over a decade of experience running paid campaigns for brands across 21 countries. The digital advertising team focuses on building campaigns that target the right audiences and maximise return on ad spend, rather than simply spending budgets and reporting impressions. With a 98% client satisfaction rate across 236 clients, the work speaks for itself. If you're ready to move beyond organic reach and invest in paid social, get in touch with Nova or explore the full range of services to see how the team approaches digital advertising.