If you don't have a social media marketing strategy in place by now, you need to rectify that. While "posting and praying" may see you get some results, it won't enable you to derive the full capability of social media platforms for brand promotion, and maximize your performance.
In order to get the most out of your efforts, you need a plan. This overview from the team at StatusBrew provides a good rundown of the key fundamentals that will establish a stable foundation for your ongoing social media marketing activities.
These are the basic building blocks for your process - take a look at the infographic below and start thinking about their application for your business.