@Ed
While you're there and Ads are on-topic, I would like to describe a thing which keeps bugging me.
On iPhone, the letters I, O and P are so close to the "Done" button that typing too fast or too clumsily and mis-hitting causes the popup keyboard to drop down. If it is a double o or a double p being typed the second tap can land on
i) the Submit button, truncating the post or
ii) The advert panel, directly underneath the submit button.
Personally, I have only ever clicked on Ads by accident; while trying to scroll the page or zoom in and select a portion of text, for instance. It's an ergonomics problem. If the Ad was on the left and the Best answer paragraph was on the right, the problem might be solved.