Without much thought nor hesitation I would recommend to everybody to block IPs in the range of 222.208.0.0 - 222.215.255.255, and 125.64.0.0 - 125.71.255.255 which belongs to CHINANET Sichuan province network — the homebase of some of the world's most dedicated and prolific spammers. They actually enter it manually.

No wonder unemployment is so low in China.