Twitter has introduced QR code functionality within the app that should make following accounts easier. In an update that was enabled server side, both the iOS and the Android app now include this functionality.
📢 hella pumped to announce the launch of QR codes on twitter! they work like snap codes!!— brittany (@brittanyforks) November 16, 2016
find yours: profile > gear > QR code pic.twitter.com/lvAr97bHj6
Similar to the way it works on Snapchat, Twitter QR codes lets you generate QR code for your account and scan other people's accounts. You will find the option in the menu under your profile. From there you can access your code or scan someone else's.
The app generates a different color code for you every time you access it. It has your display picture in the center and the Twitter logo on the bottom right.
The functionality has already been enabled for all users.