Twitter: 200,000 active users per week

TechCrunch has the gossip:

The key measure of Twitter usage is total users, total active users and total messages sent. And according to a source close to the company, these are the current Twitter usage stats:

March 2008
Total Users: 1 million
Total Active Users: 200,000 per week
Total Twitter Messages: 2 million/month

Those stats have roughly doubled just since January, when Twitter had just 100,000 active weekly users. Previously it took nine months to double in size – In April 2007 the service had 50,000 active weekly users.

Now I wonder how many of those Twitter messages are international text messages at a few pennies per message?