You can also work some magic in person. Show up to any signings or discussions, even if you just drink coffee and don't participate. Ask for the book at your local library or bookstore. Read the paper version in public (train stations are really great for that sort of thing). And you can also talk to your friends, or email them about the work.
You can still have good external visibility. What matters is not being number one. What does matter is getting onto somewhere in the top three search results and then working from there. Of course, the higher the better. But the difference between page 100 and page 1000 of search results is a moot one.