Social networking has taken off as one of the most popular activities online. Companies are eager to buy social networks, build them, or promote products and services through them. The real question now is determining the value and viability of social networking websites as a marketing tool.

To help marketers understand the changing landscape, this Hitwise report will cover:

• An overview of social network growth trends.
• Changes in audience profi le of social networking websites over the last year.
• Which industries are most affected by social networks.
• How social networks will become a primary channel for targeted marketing.