There is most definitely great benefit using Facebook to help promote your business. It can help get the word out about your product or service; it can help you connect with your customers to build relationships; and it can be extremely useful for promotions.
All that being said, it’s only as useful as you make it to your customers. Sure, you can create a Facebook page but if it’s never updated and managed then it’s not very useful for your customers. When you decide to create a presence on a social site such as Facebook be sure you have the time and resources to stay dedicated to that effort, otherwise you might give the impression that your business is not very active.
So, in summary: Yes, sign up for a Facebook page, but only really promote it if you plan to keep it updated.
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