Who are you?
Why are you doing what you're doing?
What/who got you to this point?
You want to let people into the inner workings of your business - tell a story. Behind the scenes posts are a good way to go. Take a look at your website - decide what it’s purpose is. Is it to sell? Is it to inform? Basically you don’t want to repost the information on your website too much. People already have access to this information, you want to show them another side of your business they wouldn’t otherwise see.
Who are the people that work hard in your company? Highlight them.
What necessary processes are involved to create your goods or services? Highlight them.
Most importantly, what is your point of difference? Highlight this!
Otherwise posting articles or other current events within your industry on your social media is an excellent way to show your audience that you are aware of the happenings in your field. It is still relevant and personable. Trying to sell a product with every post will eventually turn people off.