Authorgraph (originally called Kindlegraph) was developed by Evan Jacobs, a software developer from Seattle. It came about when Evan attended an author reading in 2010 where the author offered to sign attendees books, having purchased the book on Kindle, Kevin had nothing for the author to sign. Now, through the Authorgraph website you can request authors to sign your eBooks. The signatures are downloadable as PDFs (viewable in applications like iBooks) or an AZW version (viewable in all Kindle apps on iPad, iPhone, PC, Mac, etc.) of their Authorgraph.
Authors can list their books on the Authorgraph website, gaining more exposure and another means to interact with their readers. Your book doesn’t even need to be in eBook format – readers can request an Authorgraph for print books too. And, authors can personalise the message for each reader.