He didn't follow him, but rather Madara/Tobi says he controlled Nagato to see the scroll that the six paths sage created (Read chapter 467) and says that the sharingan, mangekyo sharingan and rinnegan are needed to fully understand the whole tablet.
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Nagato became evil because his best friend Yahiko was killed by the man named Hanzo leader of the hidden rain village
Nagato in naruto is pein.Nagato became pein in the 2nd great ninja war.Jiraiya took him,yahiko,and konan as his students.Now nagato is the akatsuki member known as pein.Pein is not the lleader of the akatsuki though.
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After Konan died Madara (Tobi) found Nagato's body and he transplanted Nagato's rinnegan into his left eye.
At first it was thought that he had black hair, but when a coloured picture came out, it showed that Nagato had red hair. :)
Not really; Pain, or actually the six paths of pain, is a technique that Nagato uses through six bodies.