WashPo Social Reader, WhatsApp, Flickr, The Voice and more on this week’s emerging Facebook apps by MAU

Washington Post Social Reader led our list of emerging Facebook applications by monthly active users this week reaching 600,000 total MAU after the publisher launched a web version of the app rather than limiting it to within Facebook — similar to what the Guardian did last week as well. Readers can use Facebook login on SocialReader.com to share their activity with friends.

We define emerging applications as those that ended with between 100,000 and 1 million MAU in the past week. This

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