Amazon Kindle launched a new @author feature that lets you tweet at writers while reading -- and possibly get some questions answered. Here's how it works: While reading on the Kindle, you can use its controller and type in @author, then your question. Kindle will tweet the question and post it on the author's page. When you get an answer -- you will be notified via email.
You can also ask a question directly to an author by going to the button below an author's page. About 15 authors have already been signed up by Kindle, including John Locke, Susan Orlean, Timothy Ferriss and James Rollins. Wonder if rants and reviews count as questions.