Second screen technology

Hi,
Recently I read a blog(http://freemanav-ca.com/rock-second-screen-roll/) which gave me some new ideas. We are planning to conduct a program in July. How can we implement this in the program? In this blog, it says about web-based platforms. The participation for this is 70 to 90 percent.
I would like to know about the pros and cons of using this.
Your replies will be highly appreciated.
Thanks in advance