In analyzing worldwide growth numbers, eMarketer expects the company to grow 24.4 percent this year to 227.5 million total users, and then increase another 18.5 percent to 269.6 million in 2015. With that steady growth, the platform will have nearly 400 million users by 2018. The sources of that long-term growth are mainly developing markets that are coming online and relying on Twitter for communication, including but not limited to Indonesia, India, Argentina, Mexico, and Brazil. The report doesn’t factor in any influence from China, as the service remains banned in that country, but eMarketer says it could ultimately have a significant impact on growth over time. Get the full story at GigaOM Read also "Twitter’s dilemma: International user growth can’t keep pace with revenue" at VentureBeat