Facebook is once again in troubled waters over its security concerns as it inadvertently routed e-mails to the wrong addresses.

The engineers diagnosed the problems moments after it began and immediately resolved it. However, because of the glitch, the affected users were unable to access their accounts.

"We’re still conducting our investigation, but would definitely like to use this opportunity to apologize for any inconvenience caused", said Nicky Jackson Colaco, Facebook spokeswoman.

This is not the first time Facebook has accidentally made information public. Privacy concerns were initially raised in March 2008, when a glitch made it possible for people to publicly view photos that members had designated as private.

"Sure, bugs do occasionally slip through the cracks, but when it’s of this nature, that’s not acceptable", wrote Raj Dash on AllFacebook. com, a site that covers Facebook news.

In a related problem, Buzz had automatically signed up Gmail users for Buzz and shared e-mail addresses without users' authority.

Google apologized to its Gmail users for problems created.