---
title: "Architect Channel: FAQ for Facebook Custom Audiences"
slug: "architect-faq-for-facebook-custom-audiences"
description: "Explains Facebook Custom Audiences FAQs in Architect, including audience population time, data-sharing limits, segmentation, and user match visibility."
tags: ["facebook custom audiences"]
updated: 2026-01-08T18:54:07Z
published: 2026-01-08T18:54:07Z
canonical: "academy.insiderone.com/architect-faq-for-facebook-custom-audiences"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://academy.insiderone.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Architect Channel: FAQ for Facebook Custom Audiences

> **Suggested readings**: [Architect Channel Facebook Custom Audiences](https://academy.useinsider.com/docs/architect-facebook-custom-audiences), [Architect Channel: Use Facebook Custom Audiences](https://academy.useinsider.com/docs/architect-setting-up-facebook-custom-audiences)

## Does Facebook Custom Audience need a long time to populate?

It depends on the number of users in the journey and their activity. For example, if the website has 1 million users per day, it will take a short time to populate. Also, the Facebook element populates selected custom audiences in real time.

## Can we send users’ attributes or events to the custom audience?

Facebook does not allow this for privacy reasons. Nevertheless, you can segment users in the [Check Conditions](https://academy.useinsider.com/docs/architect-check-conditions) and [Starter elements](https://academy.useinsider.com/docs/starter-elements) to determine which segments are passed to custom audiences.

## How do we know if users have been matched after they’ve been passed to Facebook?

Facebook does not provide this information for privacy reasons.

## Related

- [Architect Channel: Facebook Custom Audiences](/architect-facebook-custom-audiences-meta.md)
- [Architect Channel: Facebook Custom Audiences Analytics](/architect-facebook-custom-audiences-statistics.md)
- [Architect Channel: Facebook Custom Audiences Troubleshooting](/architect-facebook-custom-audiences-troubleshooting.md)
- [Architect Channel: Using Facebook Custom Audiences](/architect-setting-up-facebook-custom-audiences.md)