Once I got going with plain, ordinary QR codes, I decided to consider some social versions, starting with Snapchat's Snapcodes.
TechCrunch thought they might fill a niche.
They didn't, for me anyway. I displayed a Snapcode sticker on the console for awhile. No one used it.
A few years later, I thought I'd check to see if Snapchat still supported Snapcodes.
I started to type into Google: "Does anyone still use Sna..." and Google autocompleted "Snapchat."
So now I'm not sure whether Snapchat is fading overall, in general.
Whether they are or not, they are still offering Snapcodes.
I even found a relatively recent (December, 2018) post that talks about them in the present tense.
I wonder if Facebook's QR entry is doing any better...