This icon first appeared on Instagram v2.0, released on September 20, 2011. The two other icons are still used on some websites and blogs.
Secondary/Windows Phone icon (2012–2016)
May 11, 2016
On May 11, 2016, Instagram ditched its original polaroid-styled logo in favor of a modern interpretation. The new look was accompanied by an update of the application's interface. When the new look launch was unveiled, it proved a divisive figure as users initially expressed general distaste of the new logo.