Security and Privacy Concerns
Many other information security experts also recommend avoiding consumer SSO at all costs.
"Personally, I recommend people don't use social media single sign-on services. They represent a security and privacy concern for a number of reasons," Alan Woodward, a visiting professor of computer science at the University of Surrey, tells me.
For starters, "they are a single point of failure outside of one's control," he says. "I'd much rather use a password manager that I control, although obviously they are not invulnerable."