If you’ve ventured online today then you might have found images from the Syrian Electronic Army appearing where advertising should be. The activist group, which supports the Assad regime in Syria, has claimed responsibility for an advertising network hack that has been timed to coincide with Thanksgiving. It’s not a hugely significant security breach, as no user data has been exposed, but many websites across the Internet have been affected. Sites run by Forbes, The Chicago Tribune, CNBC, PC World, the NHL and Canadian broadcaster CBC are said to have been affected. It’s believed that the SEA’s route of attack was through the popular commenting platform Gigya.