FB is a business opportunity much like etsy and ebay. I do think a person should do a "Like" page for their items for sale. It is really easy, then they send their friends invitations to "like" the page so they will see the items posted for sale.
Right now I am managing 4 pages for a friend who has a business, one is selling little girl clothes, one is for the dance studio, one for the gym, and one that is general announcements for the whole business. It is a bit of work for me but I am really enjoying it. I spent 4 hours the other evening taking photos of blessing/christening/baptism dresses and posting them. It was so much fun.