B2B Marketing Stats for Twitter, Facebook, and LinkedIn | Social Media Today: Key Findings
In summary, these are the three key findings for each channel:
Facebook: Strongest channel for driving visits
LinkedIn: Strongest channel for driving pageviews
Twitter: Strongest channel for driving leads
This data reveals that one social channel might be more effective than another based on the goal you're trying to accomplish. However since they all have different strengths, an integrated marketing approach will give you the greatest results for your effort.