The Best Birthday, Page Modders and Phone Apps Hit Our Weekly List of Top Facebook Gainers by Monthly Average Users

What is it that makes Birthday Cards so dang successful? Back in September, when looked at why birthday messages are popular on Facebook, the RockYou app only had two million users. Now it has over 40 million monthly active users (MAU), and regularly appears at the top of this AppData list of top Facebook apps by MAU growth.

Our answer then was that public wall postings are valuable to both sender and receiver on Facebook in a dynamic that beats sending a Hallmark card.

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