New All-Time Record For Tweets Per Second
January 7, 2011 5:14 am6939. Thats the new record for the number of tweets per second. This record was reached on, you guessed it, 1 Jan this year. 
Just four seconds after midnight in Japan on January 1st, Twitterers set an all-time record in the number of Tweets sent per second (TPS). At that moment, the world sent a staggering 6,939 TPS wishing friends and followers a fond “Akemashite omedetou gozaimasu” (“Happy New Year!”).
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Compare this with this fact : Total Tweets Every Second Is Just 1000
Statistics Source: Twitter Blog
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