I recently ran across a great comparison between traditional and social media marketing. It provided six criteria, on which to compare and evaluate the inevitable social media marketing vs. traditional methods of marketing:
Social media is produced through self-publishing and user-generated content vs. the professional media outlets such as television, radio, newspapers and magazines used in traditional media.
Social media leverages pull marketing while traditional media relies on push marketing strategies.
Social media requires a far smaller monetary investment than traditional media usually does.
Social media typically reaches and influences a highly targeted or niche market vs. traditional media which often reaches a broader audience.
Social media messages come directly from individual consumers while traditional media messages most often come from the company behind them.
Social media is highly interactive generating ongoing conversations between multiple individuals while traditional media provides one-sided messages in a passive format.