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To the browser, unless you have a pre-populated list, the autocomplete URLs are just a list of strings. How should it know if penisland.com is a website that sells pens or otherwise? Also, where do draw the line really? therapistfinder.com? expertsexchange.com?

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Autocomplete URLS don't have to be just lists of strings. Many sites already send down metadata to indicate that they are serving up adult content.

That "honor system" approach, coupled with a pre-populated list that gets updated with regular browser updates, could catch the vast majority of embarrassing situations, like the time I found "handcuffedlesbians.com" in the URL bar at a client's site.

Google already classifies sites as porn or not-porn. They could make a simple API or data file available and the browsers could use it.

You want to tell google each time you visit a porn site?

(not that they don't know already since the site probably uses google analytics)

I think Bloom filters would allow offline checking, without pinging Google for each request. They already do this for antimalware notices, iirc.

Google developed porn filters during a crisis in 2001. It's a very valuable technology that they're not going to let just anybody share

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