Statista is a statistics and demographics repository with over 1,000,000 data sets. Though this source focuses heavily on industries, it also includes social and health data.
Full topic list is here: http://www.statista.com/topics/archive/
The data sets can be downloaded into Excel and the basic graphs and charts representing each data set can be downloaded into PPT and PDF.
A variety of bibliographic citation styles are offered for each data set.