The Cisco Meraki MR access points and MX security appliance allow administrators to set up a splash page, which can be further configured to link up with a Facebook page, so a user is required to "check-in" to that page before they can join the network. This article outlines some additional requirements and considerations when using Facebook Wi-Fi.
When configuring a Sign-on Splash page with Facebook Wi-Fi, any age and/or country restrictions configured on the Facebook page will prevent successful pairing with the SSID. When this happens the following message will appear on the Configure > Access control page:
The Facebook page should not have any countries listed in its “Country Restrictions” settings. Additional information regarding Facebook Wi-Fi integration with Cisco's Meraki is available on our web site. The Facebook Wi-Fi FAQ is available on the Facebook website.
Typically, admins will choose to prevent users from accessing the network prior to signing on. Admins can then choose to configure a "walled garden" of allowed sites that users can visit. Typically when configuring an externally-hosted splash page, that page will have to be added to this walled garden, or users will be prevented from signing in at all.
For Facebook Wi-Fi, "facebook.com" is added automatically to this walled garden, specifically so users can be redirected to the authentication page.