IPhone users were suddenly logged out of their Facebook Inc (NASDAQ:FB) accounts on Friday night. 

What Happened: Many iPhone users took to Twitter to complain about being logged out of Facebook.

Technical Glitch: The tech company confirmed the outage to USA Today, stating it might have been “due to a configuration change.” 

"We’re looking into reports that some people are currently having to login again to access their Facebook accounts. We believe this was due to a configuration change, and we’re working to get things back to normal as quickly as possible."

Android users seem not to have been affected.

It's unclear how many users were affected.