While the news that Google and Microsoft Bing are to block 100,000 search terms that could potentially link to child abuse imagery will be met with criticism from many worried about Government inspired censorship. This move move combined with the appropriate indications that a search was blocked because it could lead to child abuse material should mean that any search terms caught up in this long secret list mistakenly can be identified over time.
While other search engines beyond Google and Bing do exist, as these account for 95% of search traffic it is a big step in reducing the ease with which those seeking this type of imagery can obtain it. Google and others have already been working to block child abuse images, so this latest step is building on previous work and technology like Microsoft PhotoDNA and VideoID which can also identify videos.
So while some will say this move is another step towards a 1984 surveillance style society where information is controlled, it is a much more boring reality that the Internet is growing up and like every human being it has to learn what are the societal norms and conform to these to avoid anarchy.