Couple of things, there are many sects of Anabaptists, for example, Mennonites are as diverse as Southern Baptists from United Methodists. I suspect Big would support some of the Anabaptists publications like SoJourners. I know much of this because my affiliation as a pastor is with the MB church, and I speak at various Mennonite Church groups, including GC or what is now known as MCUSA of which my daughter will soon be named Communications Director for the denomination.
As to being able to find a Amish person on a message board, it may not be as difficult as you think, especially if that Amish young adult is going throuh Ramspringa. I have in fact found many Amish individuals on message boards, even having MySpace or Facebook pages.