What are some important differences between one-on-one communication strategies

What are some important differences between one-on-one communication strategies and broader strategies such as a social media campaign? How do they fit together?
Alinsky for the Left: The Politics of Community Organizing

http://mn.gov/mnddc/parallels2/one/video/ed_roberts-pipm.html
How is evaluating advocacy efforts similar to evaluating other individual or program outcomes?
https://ssir.org/articles/entry/transforming_activism_digital_era_advocacy_organizations

What advocacy efforts will need to continue in order to assure full citizenship for people with disabilities?