When the large ISPs rolled out their poorly-named “porn filters” in December, they all arrived missing an essential feature: a tool to check whether each filter blocked a specific URL or not. Without these tools from Sky, BT or TalkTalk, anti-filter campaigners resorted to using the only such service available, which happened to be from O2. O2, being a mobile provider, had actually been filtering content since 2004, but its URL checker (urlchecker.o2.co.uk) had largely been ignored for several years.

The storm of abuse that O2 received in December was therefore quite unfair: it was targeted, not for being the worst offender, but for being the most transparent of all the mobile and broadband Internet providers. Unsurprisingly, it wasn’t long before O2 took its URL checking service offline; and although the company denies this was done to stop people sending angry tweets, the page is still offline today, displaying the message:

Our URL checker is currently unavailable as we are updating the site.

More about O2 and the UK’s Porn Filter fiasco at Sex and Censorship…