Interestingly, Google 2011 revenues are $37b, profits $9.7b, ratio almost exactly the same. Google also has 10x the number of employees as FB. Of course FB growth is much faster.
Consider that in 1996, there were far fewer people on the internet/web. It doesn't really make sense to compare absolute revenue numbers. Growth rates and revenue per user would probably be more interesting.
We're the 7 years of Google vs Facebook, comparing the growth from launch to IPO. Even in 2003, the amount of people and time spent online was far less than it is in 2012.
For example, there are an estimated 2 billion people online today, compared to 360 million in 2000.