I dont see either company as good examples. I have or can have a single authentication identity to instagram/facebook and youtube/gmail/google. I might have a

I dont see either company as good examples. I have or can have a single authentication identity to instagram/facebook and youtube/gmail/google. I might have a separate profile/persona on instagram/facebook or youtube/gmail but the sign in is the same identity. Yes instagram does have its own segregated identity infrastructure, but its identity brand doesnt get reused anywhere but instagram. This article was about identification and authentication, not necessarily what you do with the services once you are logged in.