@KirAsh4 thanks for sharing all your knowledge with all of us. I am a MM enthusiastic and following all your shared info i did a lot of progress in my little project, however i am not able to see the way around to have my Facebook Birthday events to be shown in my MM calendar.
To be more specific not sure how to find the webcal address for it, i tried following this instructions how to get the ical: https://digibites.zendesk.com/hc/en-us/articles/200299683-How-do-I-get-Facebook-Birthdays-or-Facebook-Upcoming-events-in-Google-Calendar- and how to open it: http://www.wikihow.com/Sync-Facebook-Events-to-iCal but i did not succeed.
Any suggestion? Much appreciated