Hi Mandy a croeso! 
Great to have you joining us!
We don’t have a Facebook group but we do have this Oxford group thread on the forum: https://forum.saysomethingin.com/t/oxford-welsh-learners-group/1948 and we also have twice weekly meetups, Wednesdays and Fridays, now via Zoom since the lockdown - I’ll send you a link
Hwyl am y tro, John
PS Sorry, that Oxford group link doesn’t seem to be working 
I’ll sort it out and get back to you 