The Twitter analytics team has released some data: we are now at  50 million tweets per day, or 600 per second.

In 2007 there were were 5,000 tweets per day (TPD). By 2008, that number was 300,000, and by 2009 it had grown to 2.5 million per day. Tweets grew 1,400% last year to 35 million per day. Now we are seeing 50 million tweets per day—that's an average of 600 tweets per second.

Tweet deliveries are a much higher number because once created, tweets must be delivered to multiple followers. Then there's search and so many other ways to measure and understand growth across this information network. The company promised to deliver more data soon, as it collects more than just TPD numbers.

Tweets from accounts identified as spam have been removed: the counts in the chart above do not include spam.