Facebook, Instagram and WhatsApp come back online after outage

Facebook, Instagram and WhatsApp came back online Monday after an outage that lasted more than six hours. Facebook said the problem was caused by a networking issue.

Facebook said its servers were unable to communicate properly, which caused outages across its system. Many of the company's internal systems were affected, making the issue more difficult to diagnose and resolve. The company said no user data was compromised.

Reports on DownDetector.com suggest the outages began around 12 p.m. ET on Monday. Facebook employees were unable to use the company's internal email, a source told CBS News.