Many marketplace products are inadequately described, making search difficult. User-generated tagging of products could improve the search experience and product visibility through crowdsourcing, particularly by making connections unanticipated or left unspecified by the creator.
Think of being able to tag or find products tagged as goth, retro-futurist, preppie, harajuku, art deco, mid-century modern, vaporwave, shabby chic, kitsch, steampunk, softboy, etc. etc.
Store owners could be able to remove tags they find objectionable?
Could be limited to purchasers?