Not seen your FB listing (dont do Facebook unless I have to!), but did you not include prices on it!
Everyone is looking for a bargain, myself included, but a price on the listing gives a good guide as to what you are willing to accept after a bit of haggling.
I now do not even inquire unless there is a price on any listing, as lots of sellers just want too much money!
Ebay is better, many more buyers, auction it at no reserve if you need to get rid of quick, fixed price if you want to wait for a better price.
I hate ebay, and so expensive to sell, but it is the only practical way to sell things for sensible price, once you have exhausted forums such as this.