Most of my clients ask me the difference between blogging and social media and which one works best. My answer is always you should do both but business blogging is more valuable if done properly.
What I recommend is post your content on your blog and then post the blog link on your social networking sites so when your followers click the link they are taken to your blog or website.
Here is a great article and infographic showing how business blogging is better than social media although I believe both should be musts for your brand.
To read the article CLICK HERE