Twitter seems to have exploded, in the last few months; Twitter has added over 30 million users in the past two months.
Since the launch of the new Twitter home page two months ago, the site has acquired over 30 million users. The new design could explain the massive increase in users over the last two months, as the sites re-design is much easier to use and navigate, not to mention it actually looks nice.
Both Facebook and Twitter are growing by 15 million members per month, as more and more users are joining on the social network bandwagon.
Twitter is now 175 million members strong, an increase of 30 million+ from its 145 million in Sept, but Facebook is still far ahead of pack with 500 million users announced back in July, and an estimated 545 million users as of today.