Wow. In September, Twitter had 145 million registered users - as of this month it has expanded out to 175 million registered users, an increase of 30 million in just 2 months - not to count, it has added a total of 70 million users since April.

It's impressive - considering Twitter had 58 million users in 2009 and 503, 000 users in 2007 - the growth is great. Twitter could be celebrating New Years with 200 million users.

Where's this growth coming from?

The new twitter.com experience - which was announced in September, as well as new initiatives like allowing users to watch and Tweet President Obama's recent town hall meeting from twitter.com would lead people to believe that the growth is the constant changing platform that Twitter is.

Twitter co-founder, Evan Williams not only revealed the above stats of Twitter growth - but also said it has grown around 100% this year on average, with 370, 000 new users signing up to Twitter every day.