Facebook users can block everyone except the Chief -Mark Zuckerberg.

The recent reports by the tech news site Tech Crunch, states that users can do all stuff, but just cannot block the chief executive officer of Facebook from their accounts.

One who wishes to try the same will witness the message: "General Block failed error: Block failed." Block Zuck says that this is "because, of course, you can't block Mark Zuckerberg".

The social networking site is a hub for nearly 500 million users across the world. The site which undoubtedly has become the latest buzz raises doubts over privacy and the security of the website and has always been an issue for regulators, and users alike.

The recent buzz is that their approximately are close to 30 billion individual pieces of data which concerns with internet links, images and news feeds which are exchanged by users on websites each month.

It is said that the inability to block anyone on the site, even if it is the founder, adds an extra touch to users' privacy concerns.