I don't know why some people get spam calls when they post their phone number on Facebook, I've had my cell number on since I've had a cell phone. I set it so only my friends could see it and I only friend people I actually know.
I just started using the new interface, and it's not as horrible as I thought it would be. Given time to get used to it, I may even prefer it over the old Facebook. Good thing too, the new Facebook will be the only Facebook pretty soon.