The latest version of the Instagram app introduces a new feature which will make it easy to view all the posts your have ever "liked" on the social network. This article will teach you how to double back on your double taps.
View Your Liked Posts on Instagram
Open the Instagram app and go to the Profile tab. Tap on the Settings button displayed at the top-right corner (3 small dots) of your screen and then scroll to the Account settings. Tap on Post You've Liked and that's it: