WTB largest Facebook groups list with urls

Hi,

I need a big list of all US/Canada/Uk/Australia groups of general talking. Need to be groups that i can join to have general messages.
I am interested on groups bigger than 50k, so the list could be very big, but the list must have the biggest groups (over 1 million members) that fit in my description.

I don't need only the name of the groups but the url of each one.

Please tell me how long your list will be (more or less) and how big are the biggest groups included. Describe the list. Remember that i need it to be general talking groups.