Smoothwall's team of intrepid web-wranglers have recently noticed a change in Twitter's behaviour. Where once, it was impossible to differentiate the resources loaded from twimg.com, Twitter now includes some handy sub-domains so we can differentiate the optional user-uploaded images from the CSS , buttons, etc.
This means it's possible to prevent twitter loading user-content images without doing HTTPS inspection - something that's a bit of a broad brush, but given the fairly hefty amount of adult content swilling around Twitter, it's far from being the worst idea!
Smoothwall users: Twitter images are considered "unmoderated image hosting" - if you had previously made some changes to unblock CSS and JS from twimg, you can probably remove those now.
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