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How many tweets related to health-care reform were there on the day the Affordable Care Act passed the House?

How many tweets related to health-care reform were there on the day the Affordable Care Act passed the House?

Answer: More than 600,000

This is in comparison to near-zero numbers in January of 2009 and tweets in the 50,000 to 100,000 range (with random spikes around 150,000) during July 2009 through mid-March of the same year. But on March 21, 2010 -- when the Affordable Care Act passed the House -- there were more than 600,000 tweets, according to Twitter government relations. The number of tweets since that day have steadily increased  -- with a few spikes. Only on March 26 did another relatively large spike occur to about 325,000 tweets when the U.S. Supreme Court began hearing oral arguments in legal challenges to the Affordable Care Act.