Hi Victor: Without question, Pew Internet has the best demographics on who is using the social media.
It seems that some topics (i.e., college related issues) will be more amenable than others (i.e., criminal justice) and I assume that most of the difference is based on age. Two-thirds of the country uses social media. 95% percent of those younger than 25 use social media. Interestingly enough, some aspects of social media (i.e., Twitter use) is skewed towards race and ethnic background so some groups like some aspects of social media more than others. Pew has the data or see my site at http://leonardsipes.com. Best, Len.
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