As I browse around Facebook it is still amazing to me how many small businesses and even large companies are continuing to set up Facebook Profiles for their business and not a Facebook Page. What these small businesses and companies do not understand is that by having your business set up as a Facebook profile and not a Facebook Page you are in direct violation of Facebook's terms of service and they could actually shutdown your profile and ban you from Facebook.
You need to know your audience, know what they like and don't like. Test posts for interaction, what types of articles and information are your fans commenting on?
http://www.disruptmg.com/free - I am constantly meeting with companies and brands about social media marketing and I notice a common mistake being made by many of them, many companies are setting up Facebook profiles for their business and not Facebook Pages.