Why do you think Chinese still use QQ? I really hate QQ! The horrible long numbers, the annoying sounds (TOK TOK TOK TOK TOK! BEEP BEEP BEEP BEEP BEEP!), the fact the computer and cellphone versions are so incompatible, the way that last time I downloaded QQ on my computer it installed QQ browser, QQ music, QQ apps, QQ games, etc...all things I never asked for.

I quite like Wechat, even though there's a lot that could be better about it. But QQ? Yuck! Why do Chinese people love to use both QQ and Wechat, when just one would do?

Of course there are differences that can be stated in many aspects  between them in many respects, not only in the functions. If you have time, I hold believe that you could try to find out figure out the process of Chinese internet development.

I just wish Tencent could focus on one programme and make it excellent, rather than developing two apps that do the same thing badly (Wechat has huge problems, such as those pointed out by Christina, but to me it's still far superior to the horrible penguin, QQ)

By the way, I blame QQ for a national tragedy in China: Chinese people have really terrible email addresses! If I want to email an American friend called Sally, her email will probably be something like sally_k182@gmail.com. But if I want to email a Chinese friend, I have to remember whether they're 10288904@qq.com, or 192829422@qq.com or 17380494@qq.com...it's horrible!

Thanks a lot, horrible QQ penguin!

@Alan

哈哈！Both QQ and WeChat come from Tencent company. QQ is a product in early stage,  which accumulates a large amount of Chinese users. So we can say the success in WeiChat depends on QQ.

Of course there are differences that can be stated in many aspects  between them , not only the functions. If you have time, I hold that you could try to find out the process of Chinese Internet development. 

PS：I'm learning English, I'll be grateful if someone can modify the sections above.