The so-called personal cloud, refers to the use of mobile phones, tablets and other terminals, seamless storage, synchronization, access and sharing of data, a group of online services. American personal cloud service is ahead of China, especially Dropbox, the founder of the company, founded in Houston, Dropbox the original intention of his old drive or forget to bring u disk (I believe many netizens have had similar experience), and now, Users are storing more files in Dropbox each day than the number of posts posted on Twitter. The research firm Isuppli expects the number of global personal cloud users to reach 500 million by the end of 2012. Compared with nearly 2 billion of the world's Internet users, the equivalent of one out of every 4 netizens uses a personal cloud.
"Survey on user usage of personal cloud Services" published by the Center for Market and Media Research, Peking University