Currency: Is this info timely?
Relevance: Does this info fit my research need?
Authority: Who is the source?
Accuracy: Is the info reliable/correct?
Purpose: Why does this info exist?
The Advanced Search feature on Google is a great way to limit the number of results you retrieve and get more focused, relevant information about your topic.
Consider limiting searches by domain-- .gov and .org will be helpful for many social issues topics.