How young is too young to be on Facebook?

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Facebook requires users to be at least 13, but kids are pretending to be older when signing up. Some worry this could be damaging to children's relationships and brains. You think:

It's no big deal.
32% (359 votes)
13 is way too young.
54% (613 votes)
I'm not sure.
14% (153 votes)
Total votes: 1125