There can be a very real issue if HN accounts have an age or birthdate associated with them which indicate that the user is under 13. In that situation where kn

There can be a very real issue if HN accounts have an age or birthdate associated with them which indicate that the user is under 13. In that situation where knowledge of age is in the hands of the website operator, the FTC has taken notice, and action. See Path's recent FTC COPPA ruling as an example. So, if HN internally keeps a reference from votes in the under-10 category of this poll to the accounts they came from, and if any of those people are under 13, there may be cause for real concern re: COPPA. There are sort of 3 ways to approach this safely... 1. don't ask, don't tell (eg: Google's main search page) 2. ask, and reject (eg: Facebook account signup) 3. ask, accept, and get consent (eg: some child focused sites) HN is pretty clearly not a child-oriented website, but if there is concrete knowledge of age, COPPA can apply.