I prefer to believe QQ is full of spyware. I am not an expert but spyware and virus are a apart of QQ. It would also slow your devices. Do you ever heard about Tom-skype? Skype's Chinese version. It's also has spyware inside. Some virus are for money and spyware is related to politic. They all help the Big Brother, or they can't make money. So many Chinese software and dangerous but popular, QQ,360,etc. If you must use QQ. You can try this: web2.qq.com the web version of QQ. I wish I could tell you all Chinese software are safe and excellent, but the fact is,they are not.

You can download the software in the official website. http://im.qq.com/qq/2013/ I am not sure if you can see this in your country. In China, nowadays, QQ and Wechat are popular. Wechat is more convenient. If you need a friend on QQ or Wechat, be free to contact me.

Well, QQ for me is a bit out of fashion. We normally use Weibo, which is quite similar to Twitter, and Wechat instead. And I guess, it is hard for you to build up a relationship in QQ, while it will be easier by Weibo.

QQ is almost all Chinese young people in the use of chat software, few people use skype, I'm sorry. If you want to download, you can go to QQ's official website. Company introduction（http://www.tencent.com/en-us/） Chinese home page （http://www.qq.com/） The English version Download site （http://www.imqq.com） my qq number：724848，You can add me，I'll help you

I have only used the international version (imqq.com) and haven't had any problems with it. I do prefer using Skype, even though more Chinese people use QQ. I do use QQ sometimes for video chatting as sometimes the connection is better when the other person's in China. The only trouble I have had before is using the imqq.com website to make a new account, but the software itself is fine.