It takes trial and error to develop an effective marketing strategy for your online business. It is wise to consider different types of marketing tools when coming up with a combination that works. Have you considered StumbleUpon?
What is StumbleUpon?
You may see it listed with other social bookmarking sites but it differs slightly. You use StumbleUpon by signing up and then downloading their toolbar. When you sign up, you will be asked a few questions about your interests