QIHU [Qihoo 360 Technology Co] SC 13G: Joint Filing Agreement [Remainder of this page has
[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Xiangdong Qi Xiangdong Qi Xiangdong Qi East Line Holdings Limited Xiangdong Qi Xiangdong Qi Director Young Vision Group Limited Xiangdong Qi Xiangdong Qi Director] [CUSIP No.: 74734M109 (1) Name of Reporting Persons]