Was this article helpful? 0 out of 0 found this helpful. This week we’ll introduce you to Snapchat’s 3V ad model, where to buy 360° VR-friendly images, a better way to track social ROI via Google, and a Twitter offering that highlights products and places (and how to buy or book them). Skim to stay connected. Collapsed size is 300x50px (MMA) or 320x50px (iab). Expanded size 300x250px (MMA) or 320x480px (iab). Loading Video Player Loading Video Player Loading Video Player This interstitial ad unit can be seen in mobile apps. Choose the right psychological moment and appropriate normalized reward. The average click-through-rate for banner ads is just 0.23 percent (much lower than its counterparts) and only results in 0.1 installs per thousand ad impressions.