Metacert of Paul Walsh has come up with a Google Chrome extension to block Porn on the internet from Porn sites, Facebook ,Twitter and other social networks.

The software does not the entire site, block the URLs that contain porn.
One may submit sites that need to be blocked.
You may download the software.
Story:
At the time of writing this post, MetaCert has labeled over 655 million pages of sexually explicit content – that’s more than 32 billion URLs. For those of you in the browser, search or family safety business, it’s technically 6.5 million unique domains and sub-domains – increasing hourly. There’s a live counter where you can find the number of pages we have labeled at any given time, here. Or just look to the right of this blog post. The number of pages/URLs is derived from the mass of linked data that we have collected and studied since 2010…
Like Norton and McAfee, we have been labeling domains and sub-domains to protect kids from unsuitable and harmful content. Our competitors focus on dozens of categories – such as religion, gambling, violence etc.. At MetaCert, we focus on doing one thing very well. We focus all our attention on labeling sites that contain ‘sexually explicit content’ and as a result, we provide much better solutions for this type of content blocking – for both enterprise and consumers. I don’t mind being bullish with my assertion as they’re both multi-billion dollar companies and MetaCert is a new startup based in San Francisco.
We’re not happy with being the best however. We want to be as good as we can be. So with this in mind, we have pushed our technology to the next level by becoming the very first company worldwide, to label folders, URLs and search strings. This means that we can now protect kids from pornography across websites such as Facebook, Twitter, YouTube and other social networks and sites that contain user generated content, without having to block the entire site.
While we have scaled our crawling and classification platform to label more domains and sub-domains than any other company in the world, we are now hard at work looking for the scalable solution for labeling URLs.
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Thanks for the blog post and links to our site – much appreciated 🙂
Small clarification if I may. The screen shot you used is from our Firefox extension and not our Chrome extension. I make this distinction only because with Firefox we simply block domains and really needs to be updated to reflect our current capability. Our Chrome extension on the other hand is pretty awesome – it completely removes all labeled domains from all popular search engines – web, image and video search. Furthermore, it removes the millions of individual URLs that we classify across sites like Dailymotion, Facebook, Twitter and more.
And lastly, at the time you post this, we had labeled over 715 million pages – there’s a live counter at the end of http://metacert.com 😉