I contradict with what the people included in your survey said.

I searched Alexa and found some useful facts. I have collected Traffic ranks of Top 6 Social Bookmarking websites countrywise. You can easily see asia is dominant in the list.

1. Alexa rank of Digg.com in different countries.
Pakistan 72
South Africa 117
United States 118
India 118
Australia 130
Bangladesh 133
Indonesia 167

2. Alexa rank of Technorati.com in different countries.
Indonesia 212
Pakistan 378
India 405
Philippines 520
Bangladesh 529
…
United States 732

3. Alexa rank of Stumbleupon.com in different countries.
Pakistan 235
India 360
South Africa 497
United States 586

4. Alexa rank of Delicious.com in different countries.
Bangladesh 1,349
India 1,858
Australia 2,065
Pakistan 2,399
…
United States2,853

5. Alexa rank of Kaboodle.com in different countries.
India 413
United States 655
Pakistan 679
Philippines 714

6. Alexa rank of Reddit.com in different countries.
Pakistan 920
Serbia and Montenegro 973
India 1,356
South Africa 1,592
United States 1,710

I think these statistics clearly explains that social bookmarking websites are more popular in Asian countries ( especially India, Pakistan, China, Indonesia and Philippines )

Hope it helps. Retake the survey dude ( lols )

There are tons of social bookmarking sites airing on the internet but i prefer. They have a powerful tool in promoting a website.