Nowadays most of the people using Facebook in their daily life. If you want to get good traffic and want increase marketing of your product and services.

Of course, it's the most important

The big advantage of a Facebook Business page to that it is very easy to target your customer base by sharing to targeted groups.

I say yes, It's Important because I also got around 25% traffic from social media which I includes Facebook, Twitter & Instagram.

Engaging with facebook is a step your business needs to take, not because your competitors will but for the sake of pragmatism. Facebook gives you a fast traffic to your blog or website.