Omnichannel for online stores: Google, Meta, email
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Google captures existing demand. Meta creates new demand. Email monetizes what you've built. Three channels, different logics, one single objective: profitable sales.
In 2024, Romanian online stores with sustained growth had an average of 3.2 active paid traffic sources. Those stagnating or declining depended on a single channel. It's not a coincidence: concentration on one channel means any algorithm change, CPC increase, or account suspension leaves you without revenue overnight.
How Do Google Ads, Meta Ads, and Email Marketing Work Together?
Google Ads
- Captures existing demand
- User is actively searching
- High purchase intent
- Higher CPC, direct conversion
- Works without creative content
Meta Ads
- Creates new demand
- User isn't actively searching
- Medium purchase intent
- Lower CPM, longer cycle
- Requires quality creatives
Email Marketing
- Monetizes existing list
- Already qualified audience
- Highest ROI per channel
- Near-zero marginal cost
- Requires previously built list
How Do You Allocate Budget Between Google, Meta, and Email?
There's no universal recipe, but there are empirically validated benchmarks for the Romanian market. An online store with a total budget of €1,000/month should start with an allocation of 60% Google, 30% Meta, and 10% email (for the platform and automations). As the email list grows, the email proportion grows with it.
This allocation isn't fixed. If Google Ads delivers ROAS 8 and Meta delivers ROAS 3, reallocate budget to Google. If Meta Ads creates awareness that feeds the email list and subsequently drives email conversions, Meta has a contribution underestimated by last-click attribution. Flexible allocation, adjusted monthly based on real data.
What Role Does Google Ads Play in an Omnichannel eCommerce Strategy?
In the omnichannel strategy for eCommerce, Google Ads has the role of capturing the demand that Meta Ads generates. A user sees a product on Instagram, searches for it on Google the next day. If you're not present in Google Shopping or Search for that product, your competitor takes the order.
Recommended Google structure in the mix: 70% budget on Shopping (Standard or Performance Max with a good feed), 20% on brand Search and high-intent categories, 10% on Display retargeting for site visitors who didn't convert.
How Do You Structure Meta Ads Correctly in an Omnichannel Strategy?
The most common Meta Ads mistake for eCommerce: a single conversion campaign that does everything. Mixed prospecting and retargeting means the algorithm optimizes for conversions but across audiences with different potential, with budgets that cannibalize each other.
The correct structure: a separate prospecting campaign (cold audiences, lookalike, interests) with a conversion objective but retargeting excluded, and a separate retargeting campaign (site visitors in the last 30 days, abandoned cart, product page viewers) with independent budgets.
Recommended prospecting/retargeting ratio for Meta: 70/30. If retargeting consumes more than 40% of the Meta budget, it means prospecting isn't feeding enough new traffic into the funnel. The retargeting audience gets exhausted and frequency becomes too high.
Why Does Email Marketing Have the Highest ROI and Why Is It So Often Ignored?
Average ROI of email marketing in eCommerce: €36 - €42 per €1 invested (source: Litmus, 2024). By far the most efficient channel in cost terms, but it requires a prior investment: building the list. The list isn't built through paid advertising directly, but through lead magnets, site pop-ups, and email capture campaigns integrated into Meta and Google campaigns.
The automation flows that matter for eCommerce: welcome email with first-order offer (average conversion: 15-25%), 3-step abandoned cart email (average recovery: 10-15%), post-purchase email with upsell at 7 days (return rate: 8-12%), and seasonal campaigns for existing customers (ROAS: highest in the entire account).
Why Measuring Omnichannel Profitability Is Harder Than Measuring a Single Channel
The biggest obstacle in omnichannel is attribution. No attribution model available today perfectly reflects each channel's contribution. Last-click undervalues Meta and email. Data-driven is better, but only available at 300+ conversions per month and depends on data quality. Period comparisons (with/without active Meta campaigns) can be distorted by seasonality.
In practice, you won't be able to precisely isolate each channel's contribution. What you can do is track total acquisition cost per new customer calculated across all channels combined, and LTV by first-acquisition channel. These figures tell you whether the mix as a whole is working, even if you can't perfectly attribute every sale. To understand how each channel covers a different funnel stage, read customer journey in eCommerce and how ads influence every stage. And to measure whether your channel mix is actually profitable, POAS vs ROAS shows why attributed revenue isn't the same as profit.
Frequently asked questions
What does an omnichannel strategy mean for an online store?
An omnichannel strategy for eCommerce means all paid and organic marketing channels work in coordination, not in isolated parallel. Google Ads captures existing demand, Meta Ads creates new demand, and email marketing monetizes the relationship with existing customers. In 2024, Romanian stores with sustained growth had an average of 3.2 active traffic sources, not just one.
How do I split my advertising budget between Google Ads and Meta Ads?
The recommended starting point for an online store with €1,000/month: 60% Google Ads (Shopping and Search), 30% Meta Ads (prospecting and retargeting) and 10% email marketing (platform and automations). This allocation is not fixed: if Google delivers ROAS 8 and Meta delivers ROAS 3, move budget to Google. Adjust monthly based on real data, not generic rules.
What is the ROI of email marketing for an online store?
The average ROI of email marketing in eCommerce is €36-€42 per €1 invested, according to Litmus 2024, making it the most efficient channel in cost terms. The flows that matter most: welcome email with first-order offer (average conversion 15-25%), 3-step abandoned cart email (average recovery 10-15%), and seasonal campaigns for existing customers which have the highest ROAS in the entire account.
Why shouldn't I depend on a single advertising channel?
Dependence on a single advertising channel means any algorithm change, CPC increase, or account suspension leaves you without revenue overnight. Romanian stores with a single active channel stagnated or declined in 2024 compared to those with 3+ traffic sources. Diversification doesn't mean being on every platform, but having at least two channels with complementary logics: one that captures demand (Google) and one that creates it (Meta or email).
How do you correctly measure the performance of an omnichannel strategy?
The most important metric in an omnichannel strategy is not per-channel ROAS, but total acquisition cost per new customer calculated across all combined channels. A customer brought by Meta Ads at ROAS 2.5 who subsequently buys 4 more times from email has a real acquisition cost much lower than the Meta report shows. Use data-driven attribution in Google Ads (available at 300+ conversions/month) and compare LTV of customers by first-acquisition channel.
How do I structure Meta Ads correctly to avoid cannibalization between campaigns?
The common mistake: a single campaign mixing prospecting and retargeting. The correct structure: a separate prospecting campaign with cold audiences, lookalike, and interests, with retargeting explicitly excluded, and a separate retargeting campaign with site visitors from the last 30 days and abandoned carts, with independent budgets. Recommended prospecting/retargeting ratio: 70/30. If retargeting consumes more than 40% of the budget, prospecting isn't feeding enough new traffic into the funnel.
At DAFE Digital we manage omnichannel strategy for your online store. Google, Meta and email coordinated, not isolated campaigns that don't talk to each other.
Omnichannel works when channels are coordinated with consistent messages and synchronised audiences. We manage the full mix so the customer has a coherent experience from awareness to retention.
Adela Mincea
Performance Marketer · Fondatoare DAFE Digital · Formator ANC
Adela is a Performance Marketer with 10+ years of paid media across Europe, the US and Asia. She founded DAFE Digital in 2023 after agency roles in London and Hong Kong, in-house work inside client organisations, and independent consulting across 27+ industries.
