Car seat saftey

So I was on Facebook and noticed my cousin (whom I don't get along with or see eye to eye with on many things) posted a video about car seat saftey for children 4 and under. Saying that they need to be in a rear facing car seat until 4. She said it was because their spine isn't strong enough to withstand a car crash (which I could agree with) and she pretty much said she was a better informed parent for knowing this information and wanted to share it with everyone but also said she looks at other parents who front face their children at even 1 years old and just thinks they are stupid. Not very nice to me. But anyways do you or will you rear face your child until 4 years old? 

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