Facebook is exploding in canada, its so popular here my members refer to it as Crackbook, it now accounts for 17.6% of its world wide traffic according to alexa, USA is only 40 and it has 10 times the population.
The effect on the dating industry has been brutal Ie lavalife & plentyoffish, Lavalife has declined 60% in the last 4 months, and 36% in the last 3 months. http://www.alexa.com/data/details/traffic_details?q=lavalife.com/&url=lavalife.com
Even i’ve been hit hard losing tens of thousands of active members per week in canada.
The US currently lags world trends because there are so many cultural differences in the US. Look at how different people in New York LA and Alabama are. Another year or 2 of social networking growth in the US and companies like Match.com, True.com are in serious trouble, although I don’t think Eharmony will feel much of an impact.