The long red bar in the graph to the right shows that half of surveyed respondents are spending between 1% and 10% of their marketing budget on social media marketing.
And overall, most companies are spending less than 20% of their marketing budget on social media... but 73% say they expect to spend more on social in the next year.
This article on emarketer has some more information, including some thoughts about analytics.
What's the story with your business? What are you spending on social media marketing, and are you planning on increasing that amount? How are you measuring your ROI?