Warnock Inc. Technology Consultation for the Future

I have an iPhone 3G and I use it over wifi at home and 3G everywhere else. I was playing around with my iPhone, installing several apps, and some require login & passwords. I'm pretty good about requiring SSL to log into websites, or using a disposable password when I can't use SSL. It got me wondering how Facebook Apps communicate. I heard a rumor that they communicate with the apple server, but had no idea if it was true.