When will have

1,000,000,000 active

users?

Date Number of Active Users

December 2004 1 million

December 2005 5.5 million

December 2006 12 million

April 2007 20 million

October 2007 50 million

August 2008 100 million

January 2009 150 million

February 2009 175 million

April 2009 200 million

July 2009 250 million

September 2009 300 million

December 2009 350 million

February 2010 400 million

July 2010 500 million

July 2011 750 million

? 1 billion

The

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a

The calculator

Models of Regression1.Linear: y = mx + b2.Quadratic: y = ax2 + bx + c3.Cubic: y = ax3 + bx2 + cx + d4.Quartic: y = ax4 + bx3 + cx2 + dx + e5.Exponential: y = a · bx

6.Power: y = a · xb

7.Logistic: y = c / (1 + ae-bx )

Linear Regression

Facebook will have 1 billion active users in April 2016.

Qua

drati

c Re

gres

sion

Facebook will have 1 billion active users in April 2012.

Cubic Regression

Facebook will have 1 billion active users in February 2012.

Facebook will never have 1 billion active

users.

Quartic Regression

Exponential Regression

Facebook had 1 billion active users in January 2011.

Facebook had 1 billion active users in June 2011.

Pow

er R

egre

ssio

n

Logistic Regression

Facebook will never have 1 billion active users.