Examples of initiatives in crowdsourcing for education that provide exchanges of complementary knowledge. 
- StackOverflow
- ClassOverflow
- Xpress
- Khan Academy Longterm Research

San Jose State University

Crowdsourcing allows the learner to get support from the crowd. The crowd can provide solutions to problems, hints to learning, and even menotring to a learner. 

Exchanging Complementary Knowledge with Crowdsourcing for Education

Jiang, Y., Schlagwein, D., & Benatallah, B. (2018). A Review on Crowdsourcing for Education: State of the Art of Literature and Practice. PACIS, 180

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