I took the plugin off my site. The AdSense ads were being served through a company called AdsOptimal and I alerted them. They allegedly are taking care of it. I downloaded and installed the most recent version of the Subscribe2 widget and it still happened. Maybe my database is compromised? Maybe serving ads on my mobile version is part of the plugin now? I don’t know but I’m looking in to another solution. In the meantime I’m happy to give you the files I’ve kept a copy of if you’d like to investigate further. Otherwise I’ve moved on.