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you are correct about points 2 and 4 but for further inegttivasion would need the IP address in question. He also suggests that the simplest answer is that The Oxford Editors have an unsecured wireless network and someone is logging on to this nearby to create the posts from the IP address. Not knowing the status of The Oxford Editors networks I’m not sure if this is relevant although you did say they had changed their passwords which suggested their network has some level of security.