Publisher's Weekly writes:
Not to be outdone by the children's and YA authors "signal boosting" their fellow authors on Twitter, two novelists, Caroline Leavitt and Jenna Blum, are promoting their colleagues with an ambitious initiative called A Mighty Blaze. Anyone can participate in the conversations on A Mighty Blaze on Facebook, Twitter, and Instagram about new releases, but for authors wanting their books to be signal boosted on these platforms, there are a few requirements: the book has to be traditionally published for adult readers, and the author's book tour has to have been canceled.
You can find the Mighty Blaze Facebook group here.
And here is the rest of the Publisher's Weekly piece.
[H/t My long-suffering agent, Laurie Fox]