In order to determine your social media platforms, you should know who your audience is. Male? Female? Age demographics?
Is your company selling to females? Try Pinterest. Here are some interesting numbers on how many people are using social media:
700 Million are on Facebook
343 Million are using Google +
288 Million on Twitter
200 Million on LinkedIn
48.7 Million use Pinterest
Determining your audience will help you decide what social media platform you should be using.
If you are using all of the above, be sure to use them properly.