With a force of gravity as strong as that of a black hole, I find it highly unlikely that the singularity would intermingle with others of its kind. Black holes are born from the explosion of massive stars that literally rip a hole in spacetime. By this being said, its become popular opinion that on the other side of the black hole (escaping the 'white hole') is a whole new region of dimensional reality - with new laws of physics and nature.
It'd be a cool thing to see though. This would add to the expanding idea that the universe is a massive sphere. Like the earth, we'd start a one location, set sail, and wind up being able to return back to that location having "sailed" across the surface of the cosmos.