For me Facebook, Twitter is the best social media network for promoting business.We can get more traffic to our website by social media. But I think in the future Steemit when more consolidated with other functions example how many followers we have in short have a statistics panel It will be a great alternative to these two and perhaps become bigger.
For you Which Social Media Network is better for business?
It depends on the kind of business you want to do, and what you need to do (promote a product? create a brand image? create a reputation? etc...) Steemit now could be a good idea to keep a business blog, while on Facebook you can keep the contact with customer and redirect them to your website... Again, it depends on what you need to do! :)