Zynga

Est. 2010 revenue: $450 million*
Game registrations: 253 million
Biggest hit: FarmVille

RockYou

Est. 2010 revenue: $80-$100 million**
Game registrations: 71 million
Biggest hit: Zoo World

Electronic Arts

Est. 2010 revenue: $100 million***
Game registrations: 58 million
Biggest hit: Pet Society

CrowdStar

Est. 2010 revenue: $100 million**
Game registrations: 47 million
Biggest hit: Happy Aquarium

Playdom

Est. 2010 revenue: $100 million**
Game registrations: 39 million
Biggest hit: Social City

Slide

Est. 2010 revenue: $30-$50 million*
Game registrations: 21 million
Biggest hit: FunSpace

Digital Chocolate

Est. 2010 revenue: $30-$40 million*
Game registrations: 2.1 million
Biggest hit: MMA Pro Fighter

* Bloomberg Businessweek reporting
** Company data
*** Wedbush Morgan Securities

Sources: Registration data from AppData