Facebook remains the most commonly used social media platform among marketers.
97% of B2C marketers surveyed by the Social Media Examiner stated that they use the world's largest social network professionally.
Among B2B marketers, Facebook's reach is a little smaller, but at an adoption rate of 89% it is still the most important social platform.
Interestingly, the use of social networks aside from Facebook differs strongly depending on whether the respondents' focus is on B2C or B2B marketing. While Twitter and LinkedIn are important to both groups, visual networks such as Pinterest or Instagram see higher usage among B2C marketers.
You will find more statistics at Statista