Justin Bieber
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Do you need more friends than Bieber?

How many friends do you need?

Justin Bieber said this week that he only has four.

"I only have like four people that I keep in contact with... I don't need a bunch of friends to make me happy," he said.

Social media like Facebook allows us to have hundreds if not thousands.

Research carried out by an Oxford professor says 4-6 close friends is about right, research carried out by a Mormon University in the States says so few friends could be damaging.

Nikki Moore, founder of the online technology site girlgeekchic.com, and Sarfraz Manzoor, writer and broadcaster, discuss whether having so few friends is good or bad for you.

"I have less need for friends now," Mr Manzoor said.

First broadcast on BBC Radio 4's Today programme on Saturday 6 April 2013.