Question: A Facebook custom audience is based on:
- the number of connections a person has on Facebook
- new people who share the characteristics of your existing audience
- people who have already expressed an interest in your business
- people who recently created a Facebook account
Explanation
A Facebook custom audience is built from people who already know the business through prior engagement or existing contact data, so it is used for warm-audience targeting rather than broad discovery. HubSpot’s audience guidance separates this from a lookalike audience, which is designed to reach new people who resemble an existing source audience. It also differs from a standard Facebook audience built from demographics, interests, and behaviors, because a custom audience is based on known signals of interest in the business. In practice, this makes Facebook custom audience targeting useful for retargeting and follow-up advertising to people who have already shown intent. HubSpot Knowledge Base+2HubSpot Knowledge Base+2
Why the other options are incorrect
Connections count This is not a HubSpot-defined basis for a Facebook custom audience, because it does not reflect prior business interest or uploaded audience data. HubSpot Knowledge Base+1
Lookalike audience This targets new people who resemble a source audience, so it expands reach instead of focusing on people who already engaged with the business. HubSpot Knowledge Base+1
New account holders Account age is not part of HubSpot’s audience framework for creating a Facebook custom audience. HubSpot Knowledge Base+1
Source for verification
HubSpot Knowledge Base: Create ads audiences in HubSpot HubSpot Knowledge Base
HubSpot Blog: How to Use Facebook's 'Custom Audiences' Feature for More Strategic Ad Targeting HubSpot Blog
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