As you probably know by now, to run a successful pop up campaign, you need to target the impressions as much a possible. I think the best way to do it is to target your competition’s URLs, rather than keywords. I’ve noticed on some forums that people do struggle with this, so rather than talking about it, I decided to make a video. Note, this also works with Yahoo or Bing.
Here is a short video about how to scrape URLs from Google.