All markets can benefit from having a solid Facebook presence, even ones you wouldn’t expect. Search engines are giving more weight than ever to social cues. Having said that, the best markets for Facebook ads are: entertainment, gossip/tabloids, employment, fitness, health, travel, personal and household services, self-improvement, ecommerce for physical goods, webinars, and live events.
With today’s advanced targeting and the gigantic Facebook user base, any vertical has potential to benefit from Facebook Ads. Any product or service that can be marketed via traditional media can be marketed via Facebook.