"We detected and resolved the issue quickly, and we are now back to 100%. We apologize for any inconvenience."
DNS refers to the Domain Name System that involves directing traffic to websites.
"Facebook isn't working clearly the start of the end of the world," a Twitter user going by the name Jamie Chapman said in post at the one-to-many messaging service.
Earlier on Monday, Gmail service was beset by disruptions that prompted users to flock to Twitter to express dismay and seek information about the Web-based email service run by Google.
An online "dashboard" that provides real-time updates regarding the status of Google services showed disruptions to both Gmail and Google Drive, which lets people store data on servers in the Internet "cloud."
The problems were solved by mid-day, according to a Google status update.