Was there a 1st century GB? JWs say, it was centralized in Jerusalem, and they use Acts 15 to prove it. However, today's WT study shows something interesting. Peter, a pillar, an apostle, MOVED TO BABYLON!(par. 9: "Some time after that meeting, Peter went to live in Babylon...")
The book of 1 Peter is presumed to be written from there, according to the All Scriptures book, and likely because of the the closing at 1 Pet 5:13: "She who is in Babylon, a chosen one like you, sends you her greetings, and so does Mark, my son." Other sources agree (e.g. http://www.biblica.com/en-us/bible/online-bible/scholar-notes/niv-study-bible/intro-to-1-peter/)
If there was a 1st century GB, why would they not all stay in Jerusalem?
EDIT: Bobcat has a thread on this already... moving my comments over there. (Didn't see it before I started this topic).
http://www.jehovahs-witness.net/watchtower/bible/278549/1/Peter-in-Babylon-1-Peter-5-13