I use the address of my P.O. box for people to send me checks, and I've never noticed any problems with that. I would never post my phone number online, and generally I give out a fake one whenever I register with someplace.
1. Yes for cell phone, no for address. 2. I'd only in practice really put it on a site which I know will be successful, and more local than anything else. (ie. Canada-based) 3. Really, not too afraid of most things. I don't care if someone prank calls me. 4. Canada 5. Yes. I'd have no problems at all if just one person had my cell number.
No, I would not publish my personal details publicly - except my full name - unless it is really necessary. However, I am not running a serious business, just working with affiliate programs, so maybe if I was running a serious online business, I would do it