Look into adjusting your Twitter account to ensure the posts on your blog are tweeted automatically. You can also borrow on the popularity of other Twitter accounts by re-tweeting and commenting on their content regularly. Your Twitter followers will appreciate the quality content, and the bloggers will welcome the exposure.
Do not post irrelevant and trivial posts on your social media profiles. Always keep your posts professional and relevant. No one cares that you got a new cell phone, or that you are standing in line at the movies. These trivial posts should be reserved for your own personal profile, not your business profile.
Have links on your main website to your main social media profiles. Your Twitter, Facebook, YouTube, and Google+ pages should all be linked from your main website. So, that customers know that they are the official websites for your company, and they can trust the content that his comment is here published on those social media sites.