My recommendation is that you select maybe 2 or 3 platforms that you are comfortable using and be consistent in your communication with your audience. If you decide to use more than 3 platforms, you can schedule your messages by using Buffer, Hootsuite, etc.
As for me, I use Facebook, Twitter, LinkedIn, Google+ and my monthly e-newsletter to engage with my audience. However, you may find that other platforms such as Instagram or Snapchat may work better for you.
In addition, if you want to maintain privacy in your life you can still use social media to your advantage. So, go ahead and get started on your social media marketing by reading this article - great stuff!