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Not a direct comparison, but when Whatsapp is adding 1 million users a day [1], 12.5 million per quarter doesn't seem like that much. [1] http://money.cnn.com/

• Alupis 12y ago
  users or people? I have multiple accounts... am I being counted multiple times? (probably). A growth rate of 12.5 million per quarter is not likely real people. However, say it is... then it's not sustainable because at a point they will be at terminal capacity, ie. everyone who wants a twitter account will have one. Then they will start to shrink as Facebook did last quarter (fewer signups than ever before).
• rco8786 12y ago
  You're comparing signups to active users. Very different.