Online Bookstore Communities

How much do readers really engage in the many online communities and forums currently being offered by Amazon, Borders, and B&N? All three sites present unique opportunities for chatting with other readers and connecting with big-name authors. There's so much going on out there: I, personally, couldn't stay away from B&N.com's current Center Stage forum, where Suzanne Brockmann is hanging out on the boards for an entire week, gabbing and answering questions about her Troubleshooters and just gen