Here's an interesting one - Twitter has added QR codes to iOS and Android apps.
Why Twitter has added QR codes, I'm not sure - Snapchat has Snapcodes which enable people to connect, which is important because there's really no discovery option on the app, you can't search for other users who you might want to link up with. But you can on Twitter, you can search and discover other users in any number of ways. Facebook too has added scannable codes to Messenger, but that also seems to serve more of a purpose - brands can more easily connect potential customers straight to a Messenger exchange.
Either way, if you're interested, here's how you locate your own QR code on Twitter.
Go to your profile and click on the gear icon to bring up the settings list.
As you can see, the 'QR code' option is front and center, click on it and you'll be taken to your code - mine is the image above.
From there, you can save your code, share it via tweet or share the link via any other means you see fit.
If you want to scan someone else's QR code, you use the QR Scanner option and align the relevant code into the frame.
You don't need to take a picture, the scanner will highlight the relevant profile details as soon as it's processed the code.
The Next Web is reporting that this functionality is not yet available to all users, so you may not see it in your settings yet.
So, there it is, Twitter QR codes. Yes, everyone is copying Snapchat these days.
Use them as you see fit.