It has come to my attention that the google ads on my site are being blocked at my work. Ads from other networks are not. I'm thinking of making some big changes but have some questions and would like to start a discussion. How often are ads blocked like this? Is it possible that google ads have a higher chance of being blocked? Maybe this has to do with my abysmal CTR (I run a forum). Would it be a good idea to swap ads during USA work hours (9-4:30 or so)? Is it possible to code ads to detect whether the ad is blocked or undelivered, and deliver an alternative ad from another network?