"Today we experienced technical difficulties causing the site to be unavailable for a number of users," a spokeswoman said in an email. "The issue has been resolved and everyone should now have access to Facebook. We apologize for any inconvenience."
The problem started early Thursday afternoon and was resolved by about 5:30 p.m. ET.
The spokeswoman said the issue was not related to the one from Wednesday, when problems with a third-party network provider shut the site down, or slowed it badly, for several hours. She didn't elaborate on the nature of Thursday's outage.