The Greenwich Village folk scene was the epicenter, but just about any major college town had a "scene". Next to Greenwich Village, the Cambridge-Boston area was a vital scene, as was the music and events that were happening in DC.

The "revival" really took off with the Kingston Trio in 1958, but a good argument can be made for the Weaver's in 1950 as launching what would become known as the revival, but it was around for decades - the revival was only when more people began to notice and commercial interests saw a way to make money.

Give Dylan credit for his art, but the revival was in full blast before he arrived on the scene.

It amazes me that anyone interested in "folk" music would make claims of "stealing" music, since the folk process was really about using songs in such fashion.