No idea but I would suggest never borrow for shorting. It is too much risk if you are wrong. Just buy the puts. Safe and sound. Nothing to borrow. No interest and you can not loose more than the premium.
I have IB account too. But I prefer buying puts for 2 reason. 1. Shorted stock could end up as a forced buying. Forced covering that is. Which will result into a loss. 2. You don't pay any interest on borrow.
My company's design center in China uses Qihu..When they had the 3Q war or something, we received mass email telling people if you have Tencent QQ msger installed, please do not remove 360 anti virus that came with the systems.
most of the people I know use 360 anti virus, cuz its free.
I do think that Qihu is not really a internet player. And the price is over-valued by 20-30%.