Email Marketing vs. Social Media: Where Should You Focus on Building Customer Loyalty ?

Key takeaways

• Email marketing shows an average ROI of €42 for every €1 invested, far ahead of social media

• Social media is essential for creating closeness and reaching new audiences, but its organic reach remains limited and dependent on algorithms

• For retention, email remains the most direct, customisable, and measurable channel

• The two channels do not oppose each other: they complement each other in a coherent multichannel strategy

• The priority choice depends on your sector, your target audience, and your ability to produce regular content

Email marketing vs social media : where to retain your customers in 2026?

You have built a customer base, your initial results are in, and now the strategic question that every entrepreneur eventually faces arises : how to keep them? Acquiring a new customer costs on average five times more than retaining an existing one. In other words, your customer base is a valuable asset — provided you invest in the right channels to maintain it.

Two levers dominate the discussions in digital retention: email marketing and social media. One is considered too traditional by some, the other too fickle by others. However, the data is unambiguous. 

Email marketing: the most profitable loyalty channel

It would be tempting to consider email as an outdated tool, overshadowed by the apparent visibility of social media. This would be a major strategic error. Email marketing boasts an average ROI of €42 for every €1 invested according to DMA studies, far surpassing the performance of social media and display advertising.

This figure can be explained by a simple reality: when you send an email to your list, you are addressing people who have voluntarily chosen to receive your communications. There is no algorithm to decide if your message deserves to be seen. No dwindling organic reach. No platform that changes its rules overnight. Your contact list belongs to you — it is an asset that no one can take away from you.

Companies send more emails aimed at retaining their customers (63%) than any other type of email, and 78% of marketers actively use email marketing as a key element of their multichannel approach. These figures reveal a widely shared belief among professional marketing teams: email is the backbone of the customer relationship over time. 

Personalisation is another major advantage of email. A tool like Klaviyo allows you to finely segment your audience — recent customers, inactive customers, buyers of a specific category — and to send each one a message tailored to their behaviour. Email marketing generates three times more conversions than social media, and personalisation is one of its main drivers. 

Social media: the essential showcase, not the loyalty driver

Social media plays a different but equally important role. While email works deeply on an already established relationship, social media operates on the surface — in the noble sense of the term: they create visibility, closeness, and a sense of belonging.

An active community on Instagram, LinkedIn, or Facebook helps keep your brand in the sight of your customers, even between purchases. A well-constructed post, a story that shows the behind-the-scenes of your business, a shared customer testimonial : these are all micro-contacts that maintain the emotional connection with your brand. This is what is called top-of-mind — staying present in your customers' minds to be their first reflex at the moment of purchase.

However, social media has a structural limitation that many entrepreneurs discover to their detriment: algorithmic dependence. On Meta, the organic reach of a page post is now below 5% on average. This means that out of 1,000 followers, fewer than 50 will spontaneously see your content. You can carefully work on your editorial line, post regularly, invest time and energy — and see your visibility collapse overnight following an algorithm update.

Moreover, and this is a point often overlooked, you do not own your community. If your account is suspended, hacked, or if the platform disappears, you lose all access to your followers. The difference with email is fundamental: your email subscriber list is a durable, exportable asset that you fully control.

Comparison: email marketing vs social media for customer retention

How to combine the two for effective loyalty ?

The real question is not whether to choose between email and social media — it’s about understanding the complementary role each plays in your loyalty strategy.

Social media is excellent for feeding your email list: a campaignMeta Adstargeted, a lead magnet (free guide, checklist, welcome coupon) shared on your social pages can quickly grow your base of qualified subscribers. Once this contact is obtained, it’s email that takes over to maintain the relationship, trigger repeat purchases, and prevent disengagement.

Specifically, an automated welcome sequence via Klaviyo can be triggered as soon as a prospect leaves you their address, whether they come from your website, your online store, or an Instagram campaign. This sequence introduces your universe, highlights your best products or services, and creates the conditions for a first purchase — or an additional purchase for an existing customer.

Regular newsletters complement this system: they maintain the connection over time, provide value (advice, news, exclusive offers), and remind customers of your existence who may have forgotten you. Customer loyalty and newsletters rank second among the most commonly used types of email campaigns, with 14.6% of marketers citing them as a top priority (Shopify data).

FAQ

Is email marketing suitable for very small businesses and artisans ?

Yes, and it is even one of the most cost-effective channels for independents. Tools like Klaviyo or Mailchimp allow you to start with a small base and very accessible costs, while automating sends to save time.

What sending frequency should be preferred to avoid overwhelming subscribers ?

49% of customers appreciate receiving weekly emails from the brands they follow. A newsletter once a week or every two weeks is generally a good balance to remain present without overwhelming. 

Can social media be sufficient for customer loyalty without email ?

It's risky. Algorithmic dependence and the lack of audience ownership make it a fragile foundation. Social media is an excellent engagement channel, but it does not alone constitute a solid retention strategy.

How can I measure the effectiveness of my retention emails ?

The indicators key metrics are the open rate, click rate, conversion rate, and unsubscribe rate. A good email marketing tool like Klaviyo provides this data in real-time and allows for quick identification of the least performing sequences.