Vague Impossible Question: More than a third of one year olds have at least one of these. What is it?

Each afternoon around 1:38pm, I ask a "Vague/Impossible Question." If you guess today's question correctly you could win Dover Cup Series Race tickets for 6/4

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Below, you will find a hint that will give you a great chance to win 

HINT:  "Instagram, twitter, Facebook"