I can provide you with information about some of the top ad sites that were popular at that time. However, please note that the advertising landscape is constantly improving, and new platforms may have emerged ever since then. Additionally, the popularity of ad sites can vary depending on geographic location, industry, and target audience. Here are some of the top ad sites as of 2021: 1. Google Ads: Aforetime known as known as Google AdWords, Google Ads is one of the most popular and traditional advertising platforms. It allows businesses to create and display ads on Google’s position in search results pages, as well as on various websites that are perhaps the Google Display Network. 2. Facebook Ads: Facebook offers a powerful advertising platform enabling businesses to a target specific demographics and interests. With billions of active users, Facebook Ads offers a vast audience to reach potential customers. 3. Youtube Ads: Owned by Google, Youtube is the world’s largest video-sharing platform. Youtube Ads allow businesses to display video ads before, during, or after other videos, reaching a broad audience. 4. Instagram Ads: Owned by Facebook, advertisement sites Instagram is a highly popular social media platform, particularly among younger audiences. Instagram Ads allow businesses to promote their services through photo and video ads on users’ passes. 5. Amazon Advertising: Amazon offers a range of advertising selections for sellers and vendors on its platform. These ads can be bought in search results and product detail pages, helping businesses promote their products with the Amazon customers. 6. LinkedIn Ads: LinkedIn is a professional networking platform which offers various advertising selections for businesses to a target a professional audience based on job titles, industries, and more. 7. Twitter Ads: Twitter provides an advertising platform enabling businesses to promote tweets, accounts, and trends to reach their target audience. 8. Pinterest Ads: Pinterest is a visual discovery platform, and businesses can use Pinterest Ads to promote their goods and services through pins and promoted pins. 9. Microsof company Advertising (formerly Bing Ads): Microsof company Advertising resembles Google Ads, offering search and display advertising across the Bing search engine and the Microsof company Audience Network. 10. Snapchat Ads: Snapchat is a popular messaging instance among younger audiences, and businesses can leverage Snapchat Ads to reach this demographic through photo and video ads. Remember that the effectiveness of an ad platform can vary based on your business’s goals, target audience, and industry. Always do your research and consider your specific needs before investing in any advertising platform.