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How to build Custom Audience from Facebook Groups

Quick & concise walkthrough on how you can create a Custom Audience on Facebook for FB ads. You can use this technique to build an audience from your competitor’s Facebook groups or multiple Facebook Groups wherever your target audience is.

We will be using the Facebook Group Member Extractor tool from Prospectss.com to get the required data from the Facebook Groups.

Step 1: Identify Facebook Groups to Scrape Data for Custom Audience

Find multiple groups that fall into your target audience/niche. Ideally, try for groups with more than 10k members. We would be able to create a custom audience from both public and private groups.

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook

For private groups, we have to be a member of that group. This shouldn’t be a problem; join the group if you are not a member.

Step 2: Scrape Facebook Member Data

Once you have identified the group that you want to scrape, we will move forward and use Facebook Group Scraper from Prospectss.
You would need to Signup on Prospectss and Install the extension for scraping the data. You can initially signup for their Free plan.

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook

Signup for Prospectss: https://prospectss.com/app/signup
Link to the Chrome Extension: https://chrome.google.com/webstore/detail/email-extractor-for-fb-gr/fdooaeafkeckhgbnbmodmjkjpfmjcbnh

You would need to use the Account Key from Prospectss and use it inside the extension to authenticate. Account Key is visible from the navbar or alternatively, you can also get it from your profile page.

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook
Prospectss Profile Page from where you can obtain the Account Key.
Once you have successfully authenticated your extension with the account key, Visit the Members sections on the group page and open the extension to start scraping. If the start scraping button doesn’t appear, refresh the page.
How to build Custom Audience from Facebook Groups, Custom Audience from Facebook
Visit the Members section and open the extension to start scraping.
How to build Custom Audience from Facebook Groups, Custom Audience from Facebook

Use the start scraping button to start the process, it should take a few minutes to scrape around 10k members. You can scrape as many members as you want. The more, the better. Sometimes you might face a rate limit issue from Facebook. Ideally, the rate limit is lifted in around 4 to 24 hours. Once the scrape is complete, it will appear on the Prospectss site here. You can download the data with emails or with UID or with both, we would go with both, emails + uid. Unlock the data and download the CSV & head onto Facebook Ad Manager.

Step 3: Build Custom Audience with the Data

Open Facebook Ads Manager & visit the Audiences page.

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook

On the audience page, Click on the Create Audience button and choose Custom Audience.

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook
For the audience source, choose Customer List. It will show you a modal window with all the data points that is required. Hit the Next button.

You will be then asked to select the List Type, choose “No”, unless you want to try some experimentation. Hit Next to proceed.

You will now be asked to upload the data list csv. Don’t download the template that they have provided, instead directly upload the CSV that we have downloaded from Prospectss.com

How to build Custom Audience from Facebook Groups, Custom Audience from Facebook

Choose a correct name for your audience and Hit Next to proceed.

Open up your custoudience tab, and create a new audience using csv data. Facebook requires a lot of parameters for uploading the data for custom audience, however all of the parameters are not compulsory, although the more the merrier. We can choose the following datapoints from the csv that we downloaded from prospectss and match it with custom audience parameters, check image for more details. Once done, uploading this data and building the custom audience will take some time. Once done custom audience will start showing up for you, however take note that it won’t show you the size of the audience as it facebook has stopped sharing the audience size with ad managers.

To sum it up, find relevant groups, use prospectss.com to scrape the data from the group, use the data to build the audience.

Some pretty slick tricks to get more ROAS for your ads using this custom audience is to find all of your competitor groups and build the custom audience with that.

If you have any questions or ideas, do share them in the comments.

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