After Konan died Madara (Tobi) found Nagato's body and he transplanted Nagato's rinnegan into his left eye.
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In the manga yes, the Sage of Six Paths was the first to wield it then Madara Uchiha then Nagato and then Tobi who stole one of Nagato's eyes. In real life however no it is not real.
He gathered a bunch of corpses, placed chakra receivers in them and channelled the six paths techniques through them
Pein or Nagato himself was much stronger than Tobi himself, Nagato had the rinnegan, and tobi had only the mangekyou sharingan, now that Nagato is dead, and tobi has stolen his eye and he has made every jinchuuriki a path of pain he is stronger, but not himself, his paths, so Nagato(Pain).
Nagato is the first user of the Rinnegan in naruto
Pein possesses the rinnegan and the founder of the ninja world also possessed the rinnegan. No one..at the moment right now in the manga..506..there is no living person with it..only two ppl known to have had it..nagato (pain) and rikudo sennin (sage of six paths) [and founder of ninja world]....both DEAD...the way the manga is leading btw...naruto might possibly have rinnegan eyes waiting to be unlocked.. After Madara kills Konan, he takes the Rinnegan from nagato and does something with it. It is unknown what he is going to do with it, but it can't be good. I am sure that Nagato is not the last we see of the rinnegan.