Do You Have a Causal Influence?

Twitter user @ange duckworth asked if friends can have a causal influence on our personality and character. Ange tweeted back that she didn't understand the question, but now he's here to set her straight. angie replied: Is there someone in your life who you feel turned you into ange duckworth? Can name somebody who i think did change my development? And susan donovan said polyamory changed her life 'forever'