400words to answer the question

Whose voices are amplified?
Whose voices are suppressed?
What is being shared (articles, links, conversations...)?
How does an 'open' platform like Twitter help learners and educators? [Twitter is open in that it is free to access on the web. It is most emphatically not open in how it does business.]
How can Twitter harm learners and educators?
How can Twitter be used to increase access to education?
In what ways does Twitter support OER-Enabled Pedagogy?