With me, it's the opposite. They tag their books with my name so that when people search for books tagged with my name, they'll see their books too. They're hoping that people who set out to buy my book(s) will buy theirs instead.
that's a great start - and good idea to link to your facebook fanpage. interesting posts and a nice, clean look to it. don't forget to promote your blog on your facebook page too!
only thing, it's not clear that you're an author, or where your books are. I notice one line in "about" with your book titles, but no links. remember, people are lazy online. unless you lead them to your books by the nose they won't go. I'm not saying bash them over the head with the fact that you're an author, be discreet about it. I end every post with a sign off of my name, genre I write in, and a link to my profile in each store my books are available.