Does your business still need a website if you have a Facebook page? - Radiant Website Design, Ltd.
You have much more room to talk about what makes your business special: its people, products/services. You can also set up a blog on your website to spread your expertise.
You own the content. If you’re not happy with your webhost, you can copy your files and go elsewhere. Facebook owns the content you put there and they can cancel your account or close up leaving you with nothing. They do not give you access to the files.
You decide when the look and functionality of your website changes. Facebook does periodic “updates” which can be substantially different from what your business needs or wants.
It’s more professional to have an email address at your company website instead of Yahoo, Gmail, etc. You can also collect emails at your company website to use in marketing campaigns.
Not all potential customers are using Facebook and other social media.