Popular microblogging service Twitter hit another milestone today, passing the 200 million mark for monthly active users. Twitter announced the milestone in a tweet this morning, thanking its users, which it called "the pulse of the planet." The 200 million mark evinces the considerable growth rate for Twitter, which has added 100 million users in the time since September of 2011.
Of that 100 million, 60 million have come since March of this year, when the service revealed it had hit 140 million users. The 200 million mark means that Twitter has more active users than Google+ or LinkedIn, which have 135 million and 187 million active users.