How to use customer data to create cheaper and more effective ads

Section 1: The real problem – you're paying too much to advertise to people who don't know your brand

Every business owner who runs online ads knows the struggle: you pour money into Facebook, Google, Instagram, and most of the budget goes to attracting people who have never heard of you. Competitors are fighting for the same audience. Meanwhile, you sit on a goldmine: the data of people who have already interacted with your business. Customers who bought, people who visited your site, and even those who abandoned their shopping cart. These people already know your brand, trust you, or at least showed interest. Advertising to them costs much less and converts much more. But most business owners don't use this data out of fear of violating privacy or not knowing how.

Section 2: What is the solution – using customer lists as ad audiences without invading privacy

The solution is simple: take the list of emails or phone numbers of past buyers or cart abandoners and create a 'custom audience' on ad platforms. The key is that you don't need to send raw data to the platform – you can use tools that perform a 'secure match' (hashing), where the platform only sees a coded version of the data. This respects customer privacy, as no sensitive data is exposed. In the end, you have an audience of people who already know your brand, to show specific ads: repurchase offers for past buyers, reminders for cart abandoners, or new products for loyal customers. The result: cheaper ads (because the audience is more qualified) and conversion rates up to 3x higher.

Section 3: How it works in practice – example of a clothing store

Imagine an online clothing store. It has 5,000 customers who bought in the last 12 months and 2,000 people who added items to the cart but didn't complete the purchase. Instead of spending R$5,000 to advertise to a cold audience of 100,000 people and getting R$15,000 in return, they create a specific ad for the 5,000 customers: 'New summer collection – 10% off for returning customers'. The ad cost for this audience is lower because the platform delivers to people who have already engaged. They invest R$1,000 and get R$10,000 in return. For the 2,000 abandoners, they create an ad: 'Your cart is waiting – free shipping today'. This recovers 15% of lost sales. The cost to create these audiences is zero – they already have the data. The only cost is the ad investment, which is much more efficient.

Section 4: How 10Dobro implements this for your business

At 10Dobro, we handle the entire process of integrating your database (customers, leads, abandoned carts) with ad platforms securely and without technical hassle. First, we map what data you already have. Then we configure custom audiences on Facebook, Google, and Instagram, respecting all privacy regulations (LGPD). In parallel, we create specific ads for each audience: reactivation, upselling, cart recovery. You don't need to learn any technology – we take care of everything. Average results for our clients: 40% reduction in cost per conversion and 60% increase in return rate from past customers. Schedule a conversation and discover how to turn your contact list into a sales machine.