Facebook users had to wait several hours Monday morning before they could see what their friends and family were up to on the weekend.
Users trying to post a status or like a friend's photo of their cat received error messages.
"An error occurred. Please try again in a few minutes," the message to users said.
Some users took to Twitter to report login problems and express their frustration.
But around 10:30 a.m. ET, the problems were resolved.
Facebook officials did not immediately say what caused the problems.