Micro-influencers: a practical guide to launching your campaign

You hear about micro-influencers everywhere — but how do you actually integrate them into your marketing strategy? How many should you approach? What budget should you allocate? How do you avoid common pitfalls? This practical guide gives you the keys to launching an effective campaign, from sourcing to reporting.

What is a micro-influencer — and why does it change everything?

A micro-influencer is a content creator whose community typically ranges from 5,000 to 100,000 followers. What distinguishes them is not the size of their audience, but the quality of the relationship they maintain with it. Their community perceives them as a trustworthy individual—a peer, a niche expert, a genuine enthusiast—and not as an unattainable celebrity.

The tangible result: its recommendations convert better. Industry data is unequivocal— an account with fewer than 10,000 followers shows an average of 4% engagement per post, compared to 1 to 2% for a million-follower profile. On TikTok, micro-influencers generate up to 18% of interactions, compared to 5% for major stars.

For a brand, this translates into a dual strategic advantage: precise targeting of a qualified niche, and a cost per result significantly lower than that of a placement with a macro-influencer. Several micro-influencers can be mobilized for the budget of a single macro-influencer profile, covering distinct and complementary communities.

Key thresholds to remember

• Nano-influencers : < 5,000 followers — ultra-local, ideal for very local or community-based campaigns
• Micro-influencers : 5,000 to 100,000 followers — the best engagement/reach ratio
• Macro-influencers : 100,000 to 1 million — brand awareness and halo effect, for large-scale launches

Discover how So Bang builds influence strategies tailored to each level in our article on the influence agency: definition and operation.

Step 1 — Define your objectives before choosing your profiles

The most common mistake is to start by searching for influencers without having defined what you expect from the campaign. The objective determines everything: the type of profiles to select, the content formats required, and the KPIs to track.

Three typical objectives, three different approaches:

• Brand awareness : You want to raise awareness among a new target audience or on a new platform. Key indicator: reach (impressions). Focus on profiles with a large following (50,000–100,000).
• Engagement : You want to create a conversation around your brand, strengthen your image, or test a new offer. Metrics: likes, comments, shares, saves. Prioritize profiles with a high interaction rate, even if it means going into the lower end of the price range.
• Conversion : You're aiming for sales, sign-ups, or direct leads. Metrics: Clicks, promo codes used, tracked sales. Select profiles whose niche directly aligns with your offer.

A well-constructed campaign begins with brand awareness, moves on to engagement, and culminates in conversion. Micro-influencers excel in the first two phases thanks to their perceived authenticity.

Step 2 — Source and select the right profiles

Selection is the most crucial step—and the most time-consuming if done manually. Here are the criteria to prioritize.

The essential selection criteria

• Thematic alignment : does the creator address topics directly related to your brand and target audience? A food brand collaborating with a general lifestyle profile loses relevance and conversion rates.
• Engagement rate : calculate it yourself on the last 10 posts ((likes + comments) / followers × 100). A good threshold for a micro-influencer: 3% minimum on Instagram, 5% on TikTok.
• The quality of comments : short, generic comments (“🔥”, “amazing!”) can indicate a passive or artificial audience. Look for questions, shared experiences, and genuine exchanges.
• Editorial consistency : Are the creator's feed and tone stable over time? A profile that changes its positioning every two months does not have a loyal audience.
• The absence of fake followers : tools like HypeAuditor allow you to check the proportion of real followers. Eliminate profiles with more than 20% fake accounts.

Where to find your micro-influencers

Three complementary approaches: specialized platforms (Influence4You, Reech, Kolsquare) which centralize research and campaign management; organic research via niche hashtags on Instagram and TikTok; and sourcing via your own communities — your loyal customers are often the best potential ambassadors.

To learn more about building a sustainable community, read our article on the ambassador program: how to structure it.

Step 3 — Write a clear and actionable brief

A micro-influencer works with multiple brands. If your brief is unclear, vague, or too restrictive, the resulting content will be disappointing—or will never be delivered on time. The clarity of the brief is directly correlated to the quality of the final content.

The 5 essential elements of a micro-influencer brief

• The brand context (3-4 lines max): who you are, your positioning, your values. Don't overwhelm the creator with your entire history.
• The objective of the campaign : be explicit about what you expect (visibility on a new product, traffic to a page, promo codes used).
• Expected deliverables : type of content (reel, story, carousel post, YouTube video), number of publications, delivery and publication deadlines.
• Key messages : 2 or 3 points that the content absolutely must convey. No imposed script — let the creator express themselves in their own voice.
• The constraints and mandatory information : mention #ad or #partnership (legal obligation in France), possible use of your brand hashtag, rights to use the produced content.

To learn more about writing an effective brief, see our complete guide: how to write an influencer brief.

Step 4 — Managing the relationship and production

Managing micro-influencers is the main source of friction in campaigns. Multiplying profiles means multiplying communications, follow-ups, product shipments, and content approvals. 80% of marketing teams that try to manage this phase manually give up, exhausted.

Some best practices to streamline the process:

• Centralize the exchanges in a tracking tool (spreadsheet or dedicated platform) rather than by email or Instagram DM — you will inevitably lose track.
• Allow realistic timeframes : a micro-influencer doesn't have a team. Expect 7 to 10 days between brief approval and delivery of the first piece of content.
• Request validation before publication : an exchange of drafts allows factual errors to be corrected without stifling creativity.
• Secure the rights from the outset : if you plan to reuse the content (paid advertising, website, email campaigns), explicitly state this in the brief and the contract. Do not request these rights after the fact.

Step 5 — Measure the performance of your campaign

Without measurement, there's no learning—and no budget justification for the next campaign. Measurement begins before launch, by defining target KPIs for each objective.

Indicators according to the objective

• Brand awareness : total impressions, cumulative reach, new followers on your own accounts
• Engagement : engagement rate per post, number of quality comments, shares and saves
• Conversion : tracked clicks (UTM), promo codes used, attributed sales, cost per acquisition

Calculate the equivalent media value (EMV)

To compare your micro-influencer campaign to a traditional media buy, use the following formula: impressions × benchmark CPM = equivalent media value. If your campaign generates 100,000 impressions with a CPM of €5, the advertising equivalent is €500. This is a useful indicator to put your investment into perspective, but it shouldn't be the sole evaluation criterion.

To structure your customer reporting around influencer marketing, discover our approach at So Bang, an influencer agency in Paris.

Micro-influencers or macro-influencers: how to choose?

The short answer: the two aren't mutually exclusive, they complement each other. A macro-influencer generates volume and immediate visibility; a micro-influencer generates trust and conversions. The hybrid strategy—a macro for the launch, a network of micro-influencers for anchoring—is often the most effective.

But if you have to choose, ask yourself these three questions: Is your target an identifiable niche? Is your budget limited? Is your goal conversion rather than raw brand awareness? If you answer yes to these three questions, micro-influencers are the obvious choice.

So Bang works with brands in sectors as varied as consumer goods, health, B2B, food and retail — with micro and macro strategies tailored to each client's objectives.

Frequently asked questions about micro-influencers

How much does it cost to collaborate with a micro-influencer?

The cost varies depending on the platform, the number of followers, and the type of content requested. In France, a collaboration with an Instagram micro-influencer (20,000–50,000 followers) generally costs between €150 and €800 per post. On TikTok, rates are often lower for equivalent reach. Some collaborations may involve product exchanges for profiles with fewer than 10,000 followers, but this practice is becoming less common as creators professionalize their businesses.

How many micro-influencers should be activated per campaign?

It all depends on your objective and budget. For a national brand awareness campaign, a minimum of 10 to 20 profiles is recommended to create a significant impact. For a conversion campaign targeting a specific niche, 3 to 5 highly targeted profiles may suffice, provided they are perfectly aligned with your target audience. Quality always trumps quantity.

Should you work with an agency to manage micro-influencers?

Managing multiple micro-influencers simultaneously (sourcing, briefing, monitoring, reporting) is time-consuming and requires specific expertise. An influencer agency provides a network of qualified creators, tools for detecting fake followers, and the ability to structure multi-profile campaigns without overwhelming your internal teams. For campaigns involving more than five profiles, agency support quickly becomes cost-effective.