IFTTT has been around for a while now—since 2010. The acronym stands for 'If This Then That,' which does a great job of summarizing what it does: allows users to create automation Recipes for various services using a Trigger (this) and an Action (that).
Services like Instagram and Dropbox are known as 'Channels,' and there are different Triggers and Actions associated with each. It's a cool idea, but the only way to set up these Recipes through IFTTT was via a web browser. That, however, changes today...