reinob I also was suprised when I sync'd my contacts. I would expected it from my close friends, but what amazed me is that people from work and customers with very high positions in several companies use it. I think it's replacing Blackberry Messenger, which is very used in my country in corporations.

Also I found that around 98% of my contacts use Whatsapp, even older people that I wouldn't even imagined they knew how to use a cell phone...