Facebook says some users were briefly unableto access the site because of a technical glitch.
The social networking site with over 1 billion usersworldwide said on Monday it made a change to its domain name system setup. Thechange resulted in some users temporarily not being able to reach the site.
The problem was detected and the site is now fully back.
A DNS acts like a phone book for the Internet, translating adomain name like facebook.com into a number that points to a specific hostcomputer.
Facebook did not say how many users were affected or for howlong. Some technology blogs say the problems lasted about 20 minutes.