At left, authors Saidiya Hartman and Tina McElroy Ansa share a quiet moment during last weekend’s Up South International Book Festival in Harlem. Right: M.J. Rose logged onto Second Life yesterday afternoon for a virtual reading from The Reincarnationist. Rose reports via email that about 30 people came to see her avatar (“me, about twenty years younger,” she jokes) and listen to an excerpt from the audiobook.