Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about the people they meet.

A woman claims her life has been ruined by someone who set up a Facebook website page in her name describing her as a vice girl.
Kerry Harvey, 23, says she received obscene pictures on her mobile phone and unsolicited calls from would-be 'punters'.
The forged profile featured her photograph

Miss Harvey, an advertising sales executive, says the prank has left her confidence in tatters.
She is pleading for tougher measures to be introduced to stop fraudsters cloning other web users.
She said: 'It was really distressing and I found it so offensive. These sites are too open to abuse and should be closed down or made safer. Since it happened I've become really self-conscious.

'I can't just go up to people and talk to them because my confidence has gone. But I feel I can't do anything about it because I have absolutely no idea who set it up.'
Miss Harvey, from Abbeydale, Gloucestershire, discovered the cruel trick after she was asked to be the online 'friend' of the woman on the bogus page, which featured a photograph of herself lifted from another site.
The request was apparently made so she would realise what was happening, increasing the satisfaction of her tormentor.
The profile was up for more than a week before the person responsible closed it down.

Miss Harvey contacted Facebook but was told experts could not find the profile as it had been deleted.
She also reported the abuse to police but was told it would cost too much to track the culprit.
Hers is the latest in a long line of online identity thefts. In a landmark case, Mathew Firsht, 38, is suing an old school friend for damages in the High Court after his personal details were displayed on Facebook under a fake profile.

He has applied for damages after Grant Raphael, 36, allegedly claimed he was a homosexual and added a link on called 'Has Mathew Firsht lied to you?' after the pair fell out in 2000.
Graham Cluley, senior technology consultant at the online security firm Sophos, has first-hand knowledge of the problems online identity theft can create.

Fraudsters set up a page on Facebook and threatened to kill his wife and burn his house down.
He said: 'The biggest problem is that anyone at any time can set up a false profile without the other user's knowledge and post anything they like.
'Millions of people use Facebook which is always going to leave users susceptible to this sort of thing.

'Generally, people can try and avoid false profile pages by posting as little personal information as possible - not just on social networking sites but anywhere on the net.