At least 2 million Tweets about the Turkish protests were posted on 31st May 2013

"The social media response to and the role of social media in the protests has been phenomenal. Since 4pm local time yesterday, at least 2 million tweets mentioning hashtags related to the protest, such as #direngezipark? (950,000 tweets), #occupygezi (170,000 tweets) or #geziparki (50,000 tweets) have been sent. As we show in the plot below, the activity on Twitter was constant throughout the day (Friday, May 31). Even after midnight local time last night more than 3,000 tweets about the protest were published every minute."
Source:  AlJazeera, 1st June 2013