This paper (15 page PDF) proposes "a framework for secure, trustworthy social networking that also creates value for user-generated content by using a blockchain-enhanced framework for social networking." Obviously a similar approach could be used in educational networking. The framework proposes mechanisms for authenticating authorship, sharing options, recognition or reward, and algorithms for nuisance management (sentiment, trolling, spam). Where blockchain comes into play is in enabling these functions in decentralized systems while protecting user privacy. We're probably still a number of years before we see anything like this widely used, but it suggests the direction we're heading.