“As we announced back in April, we’ve been updating addresses on Facebook to make them consistent across our site. In addition to everyone receiving an address, we’re also rolling out a new setting that gives people the choice to decide which addresses they want to show on their timelines. Ever since the launch of timeline, people have had the ability to control what posts they want to show or hide on their own timelines, and today we’re extending that to other information they post, starting with the Facebook address.”
A Facebook spokesperson, in an email sent to me today regarding several press reports on Facebook’s decision to switch the default email account on a person’s Facebook timeline with a Facebook-provided email address, as outlined by LifeHacker.
I.e. Facebook will still spam the shit out of you (if you have notifications turned on), but if your friend wants to send you an email by getting your address off your profile, they’re shit out of luck unless you change it back. Looks like the change happened whether or not you have timeline.