You may be getting away with it but it is against Facebook rules. It was always against Facebook rules but wasn't enforced until PETA bought a share of Facebook.I've sold almost 50 poults on Facebook this year. I'm not a Facebook expert but we found a local Facebook homesteader group in our county and we post there when availible. You can't put prices you say I have so many avalible PM me for info.
They are constantly changing their algorithms so what you get away with today, you may not get away with tomorrow.