If you know Tamar Weinberg, you know, she knows, social media.

If you don’t know Tamar Weinberg, then when I tell you she’s the community and marketing manager for Mashable–the #1 social media blog in the world–you’ll believe that she knows social media.

So, you’ll probably want to jump on this opportunity to win one of 3 copies of her fantastic new book The New Community Rules: Marketing on the Social Web.

As the book promises, it will help you:

• Explore blogging and microblogging, and find out how to use applications such as Twitter to create brand awareness
• Learn the art of conversation marketing, and how social media thrives on honesty and transparency
• Manage and enhance your online reputation through the social web
• Tap into the increasingly influential video and podcasting market
• Discover which tactics work — and which don’t — by learning about what other marketers have tried

You in?

How to enter this contest? Simply leave a comment below and we’ll randomly pick 3 winners (deadline for entry is 1pm ET this Friday).

That’s all you need to do! And, if you don’t win, you can grab a copy from Amazon.com.