facebook like for hotspot page

Hello,
I want to add like button to hotspot login page.
It’s simple to past html code to hotspot page, but I’m confused what to do with walled garden. There I need to insert facebook’s ip addresses but I’m not sure how to catch all needed IP addresses.
Does someone have idea how to do that?

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You can add [like] html code in alogin page
and change waiting time (sec)

http-equiv=“refresh” content="> 2> ;