Here is how it describes itself:
Split This Rock explores and celebrates the many ways that poetry can act as an agent for change: reaching across differences, considering personal and social responsibility, asserting the centrality of the right to free speech, bearing witness to the diversity and complexity of human experience through language, imagining a better world.
Split This Rock is dedicated to revitalizing poetry as a living, breathing art form with profound relevance in our daily lives and struggles. Our programs integrate poetry of provocation and witness into movements for social justice and support the poets of all ages who write and perform this vital work.
It looks like a great site, and I think teachers will particularly like that it’s searchable by theme and through other categories.
I’m adding it to The Best Teacher Resource Sites For Social Justice Issues.