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Avoid These Facebook Ads Mistakes in 2021

Published on: November 17 2023 by Andrew Hubbard

Avoid These Facebook Ads Mistakes in 2021

Table of Contents

  1. Introduction
  2. The Evolution of Facebook Ads
  3. The Pitfalls of Single Interest Ad Sets
  4. The Power of Broad Interest Targeting
  5. The Benefits of Multiple Ads per Ad Set
  6. The Shift Away from Engagement Ad Campaigns
  7. The Efficiency of All Placements Option
  8. Keeping Up with the Changes
  9. Conclusion
  10. FAQs


In this article, we will discuss the evolution of Facebook ads and how the strategies that used to work in the past may no longer be effective today. We will explore the pitfalls of single interest ad sets, the benefits of broad interest targeting, the advantages of using multiple ads per ad set, and more. By understanding these changes and adapting our approach, we can improve the performance of our Facebook ad campaigns and stay ahead in this ever-evolving platform.

The Evolution of Facebook Ads

Facebook ads have undergone significant changes over time, and it is crucial to stay up-to-date with the latest strategies. What worked a few years ago may now be considered outdated or even bad advice. The Facebook algorithm has become more sophisticated, making it better at finding the target market within broad audiences. As a result, the use of single interest ad sets has lost its effectiveness. Instead, targeting larger, more inclusive audiences or grouping similar interests together can yield better results.

The Pitfalls of Single Interest Ad Sets

In the past, marketers recommended setting up different ad sets with one specific interest each. However, this approach has several drawbacks. Firstly, it creates a messy campaign structure and limits the budget allocation for each ad set. Secondly, the Facebook algorithm has become adept at finding target markets within larger, more diverse audiences. Therefore, it is more effective to target broader interests or group similar interests together within a single ad set.

The Power of Broad Interest Targeting

In 2021, Facebook favors larger, more comprehensive audiences. Instead of focusing on multiple small interests, marketers have found success in targeting broad interests such as "health and fitness." These broad interests allow the algorithm to optimize and deliver ads to the right audience at the right time. By adopting a more holistic approach and utilizing the all placements option, marketers can achieve better performance and reach a wider audience.

The Benefits of Multiple Ads per Ad Set

Previously, marketers would create separate ad sets with only one ad in each to ensure an even distribution of the budget across multiple ads. However, Facebook's algorithm has undergone changes that make this approach less effective. Facebook now goes through a learning phase and requires a minimum of 50 conversions per ad set per week for optimal performance. By using multiple ads within an ad set or dynamic creatives, marketers can achieve better results and optimize their campaigns more efficiently.

The Shift Away from Engagement Ad Campaigns

Running engagement ad campaigns solely to boost social proof on ads has lost its relevance and effectiveness. In the past, some marketers would run engagement campaigns targeted at low-cost countries to generate likes and comments. This strategy used to improve click-through rates and lower costs. However, the additional cost of running engagement campaigns and the lack of engagement received no longer justifies the expense. Marketers are now advised to focus on conversion campaigns instead.

The Efficiency of All Placements Option

Separating out ad sets targeting different placements used to be a common practice to customize creatives and optimize performance. However, Facebook's algorithm has become more sophisticated in delivering the right ad to the right placement. By utilizing the all placements option and customizing ad creatives at the ad level, marketers can save time, improve performance, and avoid the pitfalls of the breakdown effect. This effect occurs when specific placements become exhausted, leading to increased costs.

Keeping Up with the Changes

As with any evolving platform, it is crucial to keep up with the changes in Facebook ads. Staying informed and consuming up-to-date information and strategies can significantly impact the success of ad campaigns. Old advice may no longer be relevant, and applying outdated techniques can hinder performance. Marketers must adapt and evolve alongside the platform to maximize their results.


Facebook ads have evolved, and marketers must adapt their strategies accordingly. Single interest ad sets, running engagement campaigns solely for social proof, and separating out placements are practices that are no longer as effective as they once were. By embracing broad interest targeting, utilizing multiple ads per ad set, and using the all placements option, marketers can optimize their campaigns and achieve better results. Staying up-to-date with the latest trends and changes is essential for success in the world of Facebook advertising.


Q: Are single interest ad sets completely ineffective? A: While single interest ad sets may not be as effective as they used to be, there may still be specific cases where they can yield positive results. It is essential to test and analyze performance to determine the most effective targeting strategy for your specific goals.

Q: Can engagement campaigns still be valuable for social proof? A: It is generally recommended to focus on conversion campaigns rather than running engagement campaigns solely for social proof. Conversion campaigns can simultaneously generate social proof and drive actual conversions, providing more significant benefits overall.

Q: Is it necessary to customize creatives for different placements? A: While customizing creatives for different placements used to be a common practice, Facebook now allows marketers to customize ads at the ad level. By utilizing this feature, marketers can save time and achieve better performance with the all placements option.

Q: How frequently should I update my Facebook ad strategies? A: Facebook's platform and algorithms are constantly evolving, so it is recommended to stay informed about updates and industry trends. Regularly reviewing and updating your strategies will help ensure optimal performance and alignment with the platform's best practices.

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