Dan Sinker, who outed himself to me as the author of @MayorEmanuel earlier this year, is a fascinating guy. The founder of Punk Planet was a journalism professor at Columbia College until he jumped to a role with Mozilla heading up an news tech partnership with Knight. Meanwhile, his Twitter lark turned into a multi-month work of art that landed him on The Colbert Report, among many other things. In our correspondence in recent months, Sinker has conveyed his genuine shock and amusement over the attention his tweets have received. Last week, his Twitter saga came out in book form, and it's doing very well on Amazon.