A downside of using Facebook is not getting access to people’s email. This is particularly important to avoid falling into the trap of relying on the Facebook algorithm.
Typically there are two ways around this:
- Get people into an email funnel outside of FB, from a blog post, for example, but direct them to an email subscription form to gain access to the group.
- Ask people to submit their email address by asking them the question upon joining the group. Like the screenshot below.