I haven't dealt with pop-ups before but the pop-up doesn't deal with advertisements outside of our niche. Meaning, it's niche related and redirects to a facebook app. What kind of code is safe to use that won't affect rankings? Also, are exit pop-ups more dangerous than using css pop-ups? I was thinking of doing something similar to http://forum.notebookreview.com/ since it's a an authority site. From my understanding they're using css pop-ups. Here are a few examples they use: Thanks in advance!