September, while in October it picked up again. From Joozone.Com.

Possible reasons for these changes are first, in February Chinese people celebrated the most important festival——Chinese New Year. This means more people spent more time with their families and friends, and therefore they didn’t have as much time for surfing online. Secondly, college students are the main users of blog services. While in July and August，they had summer holidays, which enabled them to have more spare time reading and writing blogs. Thirdly, with improvements of blog services and the influence of some “star bloggers”, most of whom are celebrities, blogs are becoming an important way for people to express themselves and communicate with others. So more and more people are starting to use these services, which help explain the overall increase shown here.