When you're promoting your new book online, you must gauge the strength of your promotions in a realistic way. Hoping that readers will notice you is not enough.
I may be repeating myself, but it bears repeating. You must have a good blog of your own on which you post relevant articles 2-3 times a week. You must then make noise about your new blog posts at social sites like Twitter and Facebook so you drive traffic to your blog. Your blog is then a good platform for launching a blog book tour or other online promotion. Check your statistics regularly - anything over 100 hits per day is okay. More is better.
I can hear you grumbling now. Stop that and just do the work.
Next, pick blog hosts for reviews or tour stops that mimic all that I've mentioned above. Even if a blog doesn't have a hit counter that you can see, there are clues to the popularity of the blog. Does the host post 2-3 times a week? How long has the blog been in existence? Is the host getting comments on a regular basis? Do they have Twitter and Facebook links, and when you go there, can you see they are promoting their own posts and driving traffic to the potential review of your book?
Finally, do all the blogs we're talking about have clear links and instructions to a sales point? It's astounding to me how many promotions don't have a buy button or a suggestion to the customer to purchase the title in review.
Next we'll talk about Twitter and Facebook and how to build your viewership at those sites. You need a serious fan club to sell your books, and you can't just sit around waiting for people to discover you. Following and (be)friending in a regular though non-aggressive way is the method you need to develop.