Instagram has evolved a lot since it's official debut 5 years ago on the iPhone and the most recent change that enables users to do away with he classic 1x1 photo crop shows how much the service is changing. If you though 60 second videos was cool, Instagram's new logo reflects upon all the new direction that the company is moving forward with. 

Gone is the classic polaroid camera logo and that is replaced with a much more simpler design with a gradient of 4 colors. This new rebrand brings instagram up to speed with the current trend of 'flat' and minimalist logo design. Today's redesign also introduces a streamlined design change across Instagram's mobile and web clients. You can read more about the inspiration for instagram's new logo here