Many companies promote their socially responsible practices via websites rather than published reports. Usually the CSR policies and activities will be found in the "About Us" or "Investor Relations" area. Look for terms such as sustainability, supplier diversity, community, corporate giving, and citizenship.
If you are not able to find a company's report on the company's website, try the Corporate Register, the GRI's Sustainability Disclosure Database, or CSRWire.
Social Responsibility reports produced by individual companies can be a good source of information on how they view socially responsible practices and their attempts to implement them.