The number of ads that Google runs on a daily basis is staggering. According to some sources, ad impressions from Google's display network end up totaling an unfathomable 24.17 billion per day, while impressions from Google Search total around 5.57 billion. This means that Google runs almost 30 billion ads every day.
Unfortunately, according to new Google research, over half of all these ads are never viewed by anyone. Some fundamental changes to the system may be needed before advertisers can be sure they're spending money on something that actually has a chance of being seen.