I don’t think there is a marketer in the world who doesn’t look at demographics. Demographics on their target audience, demographics on properties they want to use to target that audience. In the perfect situation they match perfectly.
When we talk about Social Media demographics are always a bit ‘hard’. Yes, we know how many men and women there are, but with Social Media we want the demographics to be more specific. This infographic tries to be specific on not just gender, but also age, education and income. And not just for Facebook and Twitter, but also Google+, Reddit, Digg, Linkedin and, there it is again, Pinterest.