All social networking sites slowly are going to unify the features available on them, and we can notice it among other things in the list of changes made in Messenger or Instagram to become similar to Snapchat. Today Instagram was released in 24th version, and in this update people noticed one change - from today we can make bigger discussions on Instagram because we can respond for comments posted under photos.
All you need to do when you want to respond for comment is to tap "Reply" button located under post. Change is available both on versions dedicated to Android and iOS. We will see if this change is going to make using of Instagram webpage more comfortable than before - pretty similar system is used on Facebook, and it works pretty well.