UPDATE: By 3 p.m., regular service had mostly returned. Down Right Now upgraded the site's status to "Possible Service Trouble."
On Thursday, a day after Facebook filed for its $5 billion IPO, a service disruption apparently struck the social network.
According to a status report from Down Right Now, users began experiencing a "likely service disruption" around 1 p.m.
Around the same time, Down For Everyone Or Just Me displayed conflicting reports that the site was alternately up and then down, then up again.
Users took to Twitter to report problems accessing Facebook.
"THIS IS NOT AN EXERCISE! FACEBOOK DOWN!! I REPEAT!! FACEBOOK DOWN! PLEASE STAY CALM AND PROCRASTINATE ELSEWHERE UNTIL FURTHER NOTICE," wrote user @Crapules.
"Everyone, Facebook's not down. They just entered their quiet period. They'll be back online after the IPO," joked @cjoh.
Have you noticed problems accessing Facebook pages this afternoon? Let us know in the comments.