Over the last week or so, when clicking on various site links, I get an ad page for Alibaba or whatever. Since the first time it happened, I have paid close attention to where I click as their ad also appeared in a proper ad space. I have definitely clicked on a legitimate link and yet the ad appears. This is becoming a bit more than annoying as once the ad page appears, there is no "Back" option and I have to close the window, reopen and start over again.