Blockchain. It’s going to be a really big deal. But I’m skeptical that it’s a threat to Google being the middle man for making money on banner ads. 2 main values Google brings to the the table is the bundle of websites in their network. Like Walmart, Google leverages their volume to drive down the cost of ads for advertisers. And the 2nd main value is that Google makes it easy for website owners for ads to be sold and to get paid either by click or thousand views. Sure, it’s possible website owners could sell ads on their own using Blockchain, but it would take a lot more work.