A Facebook page for your business is better than nothing, but it really is no substitute for a website. In fact 98% of businesses say it is not a replacement for a website, so I am guessing they have seen a difference as a owner and a consumer.
Do you trust a company that doesn't have a website? 56% of consumers say they don't. Most people want to know that a business is going to stick around before they seek them out and buy. Most people want to see images of a shop or a product before they take the time to go there. If your business is a restaurant make sure you post images of the interior and menu at the very least on your Facebook page.
So, if you are a micro business or small business, what is stopping you from starting your website? Yes, it takes time and I know time is of short supply for a small business owner, but a simple site can be put up rather fast.
Here are some pretty easy website builders that you can use. you can also hire someone to create it (this is the kind of work PLM does - feel free to contact me) and then you will be able to easily edit it after it's been built.
If you don't have a website, check out these free website builders and then make sure to read the PLM blog posts so you can help your new website be the best it can be.
So, you're open, you're a business - now get a website and prove it.