There's no denying that Facebook is one of the most (if not the most) powerful marketing platforms in the world today. It's capabilities for advertising, targeting, optimising and data capture are unparalleled. There really is no other place where you can put your ads directly in front of your ideal customer demographic.
As well as paid ads, you need to have your organic page populated.
A) To keep your organic followers tuned in with your updates, content, promotions and to just keep them engaged all of the time.
B) To make sure you're not spending money driving traffic to an inactive page.