My Zumba instructor does it. Our judo club does it too. Both use Facebook pages instead of a website to promote their businesses. They have more in common too - both are running a business on their own and depend on keeping their class numbers up to keep afloat.
Let's look at how well this works.
Facebook makes sharing news easy
Photos of classes, competition results, and confirmation of this week's class times are easy to do on Facebook, especially if you already spend a lot of time using Facebook. Facebook's mobile interface is easy for quick updates so you can add stuff from wherever you are. Once you have made an update, everyone who has a link to your page is automatically informed. All good stuff.
By contrast, some people find updating a website is a lot more effort, requiring you to be at a desktop computer. Or the...