1.76 billion tweets were set loose in April 2010 – compared to “only” 1.2 billion tweets on January 2010. This means Twitter is growing rapidly.
Pingdom is trying to predict how many tweets will be published by January 2011, bases on the current growth rate of Twitter. And the number they got? 6.7 billion tweets.
By any measure, activity on Twitter is increasing significantly every month. Even if Twitter were to not match the current 16% monthly growth, it would still grow big time. For example, growing 10 percent per month becomes 214% over a year (i.e. the number of tweets would more than triple).