From 9 to 5 Mac:
(...) I am now experiencing this myself, and it makes browsing on the iPhone unusable. Browsing to websites such as Reddit and Reuters and others now automatically open the App Store. In many cases, there is no way for me to read the actual content on the pages.
Be sure to check out 9 to 5 Mac’s video of these types of ads in action. In my experience, switching to the Chrome browser from Safari made no difference. The issue is likely something Apple needs to fix in the underlying code that powers all browsers on iOS1.