There's a section for trading, not really anything for selling. If it's a store-released Pixies/FB/BF disc that you're parting ways with I suppose that's ok. Selling of bootlegs, homemade copies, live shows, etc - essentially anything not release by FB - is not ok. Hope that helps and appreciate that you asked first. Good luck.
"Now you're officially my woman. Kudos. I can't say I don't envy you."