Am thinking that it is about the targeted ads. Sometimes before I sign in I get the warning about targeted ads. But I have adblock so once I sign in I don't see it or any ads anymore. I understand that she makes a few pennies when people click on the ads. But since I have adblock, and don't click on any ads, I donate to the site.
I've been getting that warning since later yesterday afternoon and into this morning. It is just now that it has stopped appearing. For whatever it's worth, it is also happening to people on another site I'm on. I'm not sure what is the problem, but I hope it is not some sort of virus we've picked up.