No matter the location you are selling it is all about the asking price on if you sell. If you list at a realistic price they will sell. As already been mentioned ebay is awesome for ungraded pricing. I find cards that sold in similar condition and try to price in the middle of ebay sold prices. I also take around 10% off that price for the fees I no longer have to pay. No clue about facebook groups.
The B/S/T section is also great and if priced right stuff sells. The auction section is still a $hit show at best with one guy making up almost half the listings. They are also listed so insanely high only one out his last 15 have even sold.