Google Plus has 150 million monthly active users -- compared to Facebook's 900 million.
Just last February, FarmVille hit its peak with more than 80 million monthly active users.
King.com is now the second largest Facebook game publisher with over 70 million monthly active users.
Viddy's monthly active users have dropped to 447, 000 from 24.6 million last June, according to AppData.
Skype currently has more than 700 million users, with close to 145 million monthly active users.
Over 250 million people have upgraded to Google Plus, with 150 million monthly active users.
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The game has 6.5 million monthly active users on Facebook, according to AppData.
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With monthly active users at 845 million, Facebook certainly is a great base for building businesses.
Monthly active users were 298 million in the quarter, up 24% from 240 million a year ago.
Zynga still sees its bread and butter on Facebook, with around 200 million monthly active users there.
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Zynga is the largest social gaming company in the world with over 230 million monthly active users.
At its peak, FarmVille had more than 80 million monthly active users though this number has declined.
Among the 1 billion monthly active users on Facebook, 600 million are mobile users, Facebook said recently.
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Mobile monthly active users totaled 680 million as of December 31, 2012, an increase of 57 percent year-over-year.
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After FarmVille, Zynga launched other hits like CityVille which currently has close to 50 million monthly active users.
The social network has more than 845 million monthly active users, or one in eight of the global population.
Monthly active users are forecast to hit 1.1 billion, a 4% sequential gain and 22% more than in 2012.
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In the prior (fourth) quarter, mobile monthly active users were 680 million, up 57% from the year ago period.
Monthly active users have risen by over a million in the last seven days too, according to Inside Facebook.
Zynga has 227 million monthly active users and 54 million daily active users.
In December, Twitter announced it had surpassed 200 million monthly active users.
Facebook founder Mark Zuckerberg announced this month that the company has more than 1 billion monthly active users.
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Mobile monthly active users were 680 million, up 57% from a year ago.
For context, FarmVille on Facebook has more than 50 million monthly active users (at its peak, more than 80 million).
Its monthly active users grew 29% to to 955 million while its daily active users grew 32% to 552 million.
They recently launched a game called Empires and Allies which has been well received, with 27 million monthly active users (MAU).
It now has close to 37 million monthly active users, but its user growth has almost plateaued in the last week.
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Zynga has become synonymous with social gaming serving 311 million monthly active users, the largest player network on web and mobile.
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In quarterly results released earlier this month, Facebook announced 751 million mobile monthly active users, up 54% from the previous year.
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