Once I got going with plain, ordinary QR codes, I decided to go incorporate some social versions, starting with Snapchat's Snapcodes.
TechCrunch thought they might fill a niche.
They didn't, for me anyway. No one used them.
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, generally, but, yes, in fact 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...