Thanks for the suggestion. We don't currently have any plans to do this, but it's a good idea. I'll pass it on to our marketing team.
Some authors run Twitter feeds or blogs for their books, and we also have book forums for some books. If there's a website, forum, or social media account associated with a book, it will be linked from the book page on our site. Also, if you'd be interested in following authors on Twitter, you can usually find their Twitter feeds from their author profile on our site.
http://www.oreilly.com/pub/au/5581 -> https://twitter.com/fogus
http://www.oreilly.com/pub/au/5271 -> https://twitter.com/addyosmani
http://www.oreilly.com/pub/au/3902 -> https://twitter.com/slicknet
I hope that helps, and thanks for the idea.
Have a great day!