"From $0 To $1 Billion In Two Quarters – Facebook's Mobile Ad Business Is Suddenly Huge"

75% of $4 million is $3 million. $3 million per day over 365 days is…$1.1 billion.

Good explanation for part of the reason why I’m confident in Facebook’s long term revenue growth. For example, mobile revenue has grown from $1 million per day at the end of Q2 to $3 million per day at the end of Q3.