Are the Jonas brothers dating ..............?

I keep reading that Nick is going out with Selena or Demi, Joe is going out with Chelsea, Brenda Song, Taylor Swift or Demi.. or that Kevin is going out with Brenda S. . .I am just wondering if any of this is true, because it's quite weird and stupid how the media makes up stuff like this.. so i wanna know if its for real.. thanks ;)