Think Tanks,many of which have political/ideological affiliations, publish research findings and political recommendations on a wide variety of social issues. Below are links a number of both conservative and liberal "think tanks" that discuss a wide range of social issues.
Conservative Think Tanks
Liberal Think Tanks
Below are links to gateway sites to public policy resources, several "think tanks" presenting well-organized research on social issues, and a few of the best resources for statistical data.