Google is on track to make more than $70bn in revenue in 2016, and the lion’s share of that number will be generated by its insanely successful advertising business. As I’m sure you know, advertisers pay a fee every time somebody clicks on a link in one of their ads. Some of the costs per click being paid are absolutely staggering, though they must be worth it, from the advertiser’s perspective. Last month I analysed a large chunk of Google Adwords data from SEMrush to discover the most expensive keywords in the UK