This is what we found on Wikipedia regarding the xiao xiao:

Xiao Xiao (Chinese: 小小作品; pinyin: Xiǎo Xiǎo Zuò Pǐn, lit. "Little Work") is a Chinese Internet Flash cartoon series by Beijing-based Chinese animator Zhu Zhiqiang (simplified Chinese: 朱志强; traditional Chinese: 朱志強; pinyin: Zhū Zhìqiáng).

The cartoon features stick figures performing choreographed fight scenes. Some of the cartoons are interactive and game-like. All cartoons are in the Adobe Flash format, with the exception of Xiao Xiao #1, which was originally in AVI format and converted to Flash format. Others have seized on Xiao Xiao's popularity to make animations exploiting the easy-to-draw style of stick figures and minimalist backgrounds, creating cartoons that are sequels or parodies of the official cartoons.