Kolkata is Still Not In Twitter Trends

When I am writing this blog it is 5:19 AM, March 17, 2012. I am kind of disappointed to know that @twi (official twitter account of Twitter India) tweeted a hour ago:

We now have local trends for 6 cities in India! Ahmadabad, Chennai, Hyderabad, Bangalore, Delhi, and Mumbai: pic.twitter.com/MXjreNjZ 

And alas! Kolkata is not in the list!!

Why????

Are not people of Kolkata active over twitter? or they tweet without the hashtagKolkata?