Facebook Revenue Estimates Slashed by $1 Billion

It's still expected to rake in $5 billion

"You know what's cool? A billion dollars."

Alas, when Justin Timberlake's Sean Parker spoke those lines in "The Social Network," he wasn't talking about the amount by which Facebook's expected revenue for 2012 would be reduced. The research firm eMarketer has done that, revising its forecast down from $6 billion to $5 billion.