7 Facebook
Saying that the Facebook app has changed significantly over the past 10 years would be an understatement. The app has been regularly updated and tweaked in the past decade, but its earliest iterations are nearly unrecognizable — maybe aside from the logo and the signature blue hue to everything.
Facebook now has so many features that weren’t present in the original app. And even the placement of important buttons has changed: the menu icon has moved from the upper-left to the lower-right corner. In the old-school menu, there used to be a prominent “Logout” button. The design itself also looks much less clean and intuitive.