Sidebar (Sticky Ads) A sticky ad is an ad unit which stays visible on the page while the user scrolls through the content of your page. Sticky ads are a non-intrusive format that can be very effective to increase CTR and your Active View metrics. Sidebar sticky ads contrary to the landscape size of horizontal sticky ads, vertical ones are portrait-sized and exist on the sides of the webpage. Sidebar sticky ads mostly consists of these ad sizes. Indicating that creative size will be rather small. Therefore, it is essential to fit the information to the banner so it would be well visible.   Creative Size Impressions 320x50 878,588,743 300x250 447,936,818 300x50 125,748,099 320x100 109,986,378 120x600 86,401,726 300x100 82,902,714 728x90 80,623,027 250x250 70,157,859 160x600 66,512,232 300x600 49,660,600 336x280 37,290,889 234x60 30,786,546 200x200 29,395,316 160x90 16,450,358 240x400 15,631,884 970x250 13,287,764 Additionally, almost 99% of all Sidebar sticky ad  traffic comes from sites.  Types Impressions Site 2,216,119,289 App 941,154 While, when it comes to countries these are the  leading markets with the most traffic for sidebar sticky ad. Country Impressions India 688,388,775 South Africa 300,994,061 Nigeria 286,324,743 Israel 111,919,042 Kenya 97,584,306 Ghana 74,210,105 Russian Federation 71,967,234 Japan 58,555,597 Malaysia 45,506,242 Bangladesh 38,867,995 Georgia 27,731,901 Indonesia 21,601,741 Slovenia 20,106,944 Tanzania 18,299,467 Turkey 18,008,583 Australia 17,173,808 Cameroon 16,517,667 Romania 16,514,997 Zambia 14,749,561 Poland 14,745,105 Global 2,217,060,443 With default optimisation Sidebar ads may deliver these kind of results:  Country Viewability CTR Nigeria 60.41% 0.14% Kazakhstan 77.75% 0.42% Kenya 62.74% 0.11% Indonesia 67.64% 0.06% Bangladesh 58.40% 0.12% Total: 64.68% 0.14% Sites were dominating when it came down to placement comparison. Apps Sites 8.86% 91.14%