As a MySpace member you're able to publish a blog linked to your profile. Here you can include content too lengthy for your messages or bulletins. Blog posts are searchable through MySpace and regular search engines like Google, so naturally you'll want to include plenty of information about your book.
If you're already publishing a blog on your own domain, you don't necessarily have to reinvent the wheel on your MySpace blog. Simply repurpose some earlier content from your own blog, posting it on your MySpace blog for the benefit of your new friends.
Ask your friends to "subscribe" to your blog by clicking Subscribe to this Blog while they're visiting. Then they'll receive e-mail alerts of your new posts.
To add a post to your blog, click Manage Blog from the menu just to the right of your main profile picture, then scroll down to the box labeled #My Controls# and click Post New Blog.
MySpace blogs contain a handy way to link to your book on Amazon. Just below the box named #Body#, where you enter your blog text, is a box labeled "Tell us what you're reading, viewing, or listening to." In the pull-down box, select #books#, then in the search box, enter your book's ISBN. This will add the link buy now from Amazon to the bottom of your blog post, along with an image of your book cover. You can forward the same link to your MySpace friends, who can post it on their blogs, adding to your exposure.
Contests and giveaways are reliable ways to promote your book on MySpace too; the only limit is your imagination. Offer a monthly drawing for a free copy of your book, awarded to one of your new friends. Just the act of offering a free drawing for your book will encourage others to buy it--they won't want to wait to see if they've won the contest.