According to Barnes & Noble, 2,111 readers have rated The Final Arbiter an average award of four and a half out of five stars. On Good Reads, the book was ranked at three stars. So the publisher is using Tumbler as a means to advertise my book using quotes from it and the hashtags #TheFinalArbiter and #MarkRivera Screenshots are below.
I don't have a Tumbler account. I came across this via a Google search.