How do I obtain a directory of the adult content policies of all social media sites

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C#3.0

webscraping

DNS

bots

So I'm working on an adult content blocker.

Most solutions on the market including things like OpenDNS, safe search, and web applications that block urls and sites do not properly work. There is always a work around.

There are higher end solutions but they have enterprise level pricing.

I'm wondering if there is ANY possible way I could get hold of a directory of all or most social media sites just so maybe I could scrape through their policies. Then I can either white or blacklist them.

I'm not too fussy on the language or the framework required.

Any input would be greatly appreciated!

What I have tried:

Most solutions on the market and I've tried getting all the social media sites I can find on google. But it's just not viable as I'm dependent on the SEO of the site and the google results.