Manning has made it his mission to find out what happened to the children in the photos, and to interview their descendants. He plans to eventually write a book and possibly make the photos and research into a traveling exhibit. [Link]It all began with his collaboration with Elizabeth Winthrop to track down Addie Card, "the poster child of child labor"—a search that made the pages of Smithsonian last year.
Manning's website features some Mystery Photos of children still waiting to be identified. For instance, these children.
Mrs. A J. Young was probably the same living in Tifton in 1920, aged 53 years, with Ben L. and Tiffie Lanier (Tiffie, 33, presumably being one of the children who "went off and got married").
Anyone want to take a crack at finding the family in earlier censuses?
Update: Mr. Manning has contacted me, and tells me that it probably was Ben, not Tiffie, who was Mrs. Young's child (the census calls them just "Son" and "Daughter"). He has found that Tiffie's maiden name was "Oliver."