As in [13], all status updates posted by both users and friends during a three-day window were processed using the list of positive and negative emotion dictionaries from LIWC 2007 [15], using the Hive database system [18], which allowed for parallel computation in order to complete the word-counting task rapidly. Use of the LIWC software package itself was not possible as these status updates constituted far more data that would fit on a single contemporary computer. Because this work was completed in an entirely computational manner, no researchers ever saw any user-generated text in an identified form1, in compliance with Facebook’s Terms of Service