kijiji is decade+ popular in Ontario and Quebec. It may be there, too.

Facebook marketplace is about on-par popularity-wise with kijiji these days. Not too long ago I had to sell a used car and put it on both and received about the same number of genuine interest responses from both sites. Kijiji is a better site in my opinion; better layout, ux, search options and filtering etc. But facebook has more people already on it so network effects.

Yes, although kijiji is as old as public Facebook, or there abouts.

whois their domain and ip range.