Q: The LMS I am using for my online course has technical constrains. What platform would you recommend for video discussions, video presentations, group presentations, and poll questioning?

A: YouSeeU is a leading platform for education - online, blended and in-classroom. More

Q: I want to make a group activity in my online course more effective. Is it any tool available that supports peer to peer evaluation?

A: CritViz is a custom online tool for supporting real-time critique, conversation, and peer to peer evaluation of student work in large classrooms. More

CritViz software

Q: Can I use twitter to interact with students during the lecture?

A: There is a real need to make sure that students remain engaged. Twitter could get students interested.
Guide to Using Twitter in Your Teaching Practice
http://blogs.kqed.org/education/how-to-use-twitter-in-your-teaching-practice/

"Twitter could be used as another method to reach students, to share content and provide information. The social nature of Twitter means you can ask questions, have conversations, and join discussions or debates.
Questioning and debating teaches us to think critically – a key skill no matter what you're studying – and online debate is a way to develop these skills. Hashtags create online communities where you can discuss a topic with your peers."
Source:  
Universities should use Twitter to engage with students

Q: I am looking for more interactive ways of teaching a big size class. It is challenging to engage students with clickers because they are limited to multiple choice. Could you recommend more modern engaging platform to use?

A: Use Top Hat's response system to engage students via their cell phones. No Clickers Required.

Top Hat: Student Response and Engagement System

https://tophat.com/features

• Students can text their answers if they don't have smart phones.
• professor and 30 students are free.

Please read more here

Q: Do you know a technology to make a process of watching video materials for students active?

A: The researchers from Leeds University, Vania Dimitrova and Lydia Lau, designed a system I-CAW that gives you semantic linked data at the end. Meanwhile you can use this tool to have your students posting comments while watching the video on Youtube.  Students are labeling their comments with a corresponding aspect. You as a teacher design the aspects to emphasize the outcomes. This tool transforms students experience from passive to active. Read more

Q: What is a status of MOOCs?

A: Failure. What did we learn from it? I am following the results of this experiment.  See the article by Rebecca Schuman: The King of MOOCs Abdicates the Throne How long the inertia of implementing online on a big scale will go? No status report yet...

Q: Please refer me to the examples of teaching approaches which are based on game design principles?

A: The scavenger game http://www.scvngr.com/ developed by Seth Priebatsh aims to envision education as a game ecosystem. 
The Center for Game and Impact at Arizona State University  http://gamesandimpact.org/ has exact same goal.
If you are interested in embodied games visit SMALLab Learning http://www.smallablearning.com/