需要对移动应用程序表单使用验证码验证吗？

I am making a HTML5 mobile app via XDK. I have some forms which I use Captcha validation in the website. In my prospective, comment spam for a mobile app doesn't make any scenes. Does anyone see any comment spam for mobile apps? Do you think I need to use Captcha validation in a mobile app form or leave it to not to bother the users?I am making a HTML5 mobile app via XDK. I have