Sina Weibo has provided file sharing service named "Micro Disk" on their Weibo, but recently they added it a new function like Slideshare.
If you have a PDF or PPT file, you can upload on their disk and share its file to your followers like Slideshare.
Of course, you can view documents that other user uploaded.
Recently, companies who use Weibo as a marketing tool is in increasing number, its sharing disk can help it powerfully :-)
Original article => Sina Weibo(Disk sharing service)