It’s been hard to miss: The tech giants have been on a bit of a shopping spree these days. Starting with the staggering $19 billion Facebook dropped for WhatsApp at the beginning of the year, the Internet has been whirling with acquisition talk every other week. With Oculus VR going for $2 billion and Nokia’s $7.2 billion deal with Microsoft, it’s clear that hardware is a hot commodity right now. We take a look back at some of the biggest purchases made by Google, Apple, Facebook, and Microsoft over the years.