Learning Lessons From the History of Social Change

Part 1.
Social responsibility has become an important interest of many organizations. Aside from creating good publicity, what other reasons would companies and corporations have for becoming involved in socially responsible causes? What benefits would involvement with a socially responsible cause offer the company and the employees? If you have had personal experience with companies involved with socially responsible causes (i.e., you worked for the company or had interactions with the company), please include a description in your post.
Part 2.
Write an explanation of factors that contribute to the success of social movements. In what ways can you pattern socially responsible action today after successful movements of the past? What circumstances have changed over time that might necessitate differences in approach?