Why do those registering forms for forums have 'Are you 13 or over?' on them. What exactly is special about being 13. I know/suspect it's a US requirement as (sadly ) that's how the internet generally works: Take care of US law and everyone else (barring dictatorships) should be OK.
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He who disagrees with me in private, call him a fool. He who disagrees with me in public, call him an ambulance.