What are your top 3 social bookmarking and social networking sites for Ecommerce?

[purch]

I am trying to figure out the best social bookmarking and social networking sites to use for my eCommerce sites.  Often in the social bookmarking platforms posting a review or a product is instantly considered spam. I know that having links from these types of sites are important but I don't want to come across as spam. What creative solutions do you use for this challenge?

[FrontlineMobility]

Make a LinkedIN group centered around your product/products chain and don't promote your business, just talk about Marketing and SEO tactics, be friendly. Basically this http://www.seomoz.org/blog/5-ways-to-prime-the-social-pump . Dr. Pete proved he is a champion of social media with this post. Use the big Boys like Facebook and Twitter, just be sincere to your audience and don't spam, and you should be fine friend. Good Luck on the quests!

Justin Smith