Partner Categories on Facebook

We all already know that Facebook is a platform for many different types of advertising.  New Partner Categories on Facebook give a better opporunity for companies to reach out to potential customers.  This new program sorts Facebook users into 500 unique groups based on interests. Once companies have access to these interest groups, they can target a certain group who may be more likely to be interested in the product.  They will no longer be wasting time advertising to people who have little or no shot of actually continuing the buying process.  This will help cut down expenses and also could potentially help customers because they will only recieve advertisements based on thier interests.  However, this could also be considered an invasion of Facebook User privacy because Facebook and outside companies are tracking users behavior online.

Do you think these new groups are an invasion of privacy or beneficial to Facebook users?
Why or why not?

Reference:
http://www.entrepreneur.com/article/226347