Celebrities often have a transitory relationship with Reddit: they arrive hawking their latest project, they answer a few questions during an ask-me-anything Q&A session, then they leave, often never to return. But The Fault in Our Stars author John Green is after a more genuine and lasting relationship with his fans and readers — he pops in threads from time to time — so he’s planning to do one AMA every month until the release of the Paper Towns, the second film adaptation of one his novels.