I went to Polleverywhere.com I made a sample poll asking "What is your favorite animal?" My students can definitely use this when collecting data to make graphs in math. This would be a fun and exciting way to get everyone involved. They can create a poll to poll the class and even their parents (we can embed it in our class blog). After they have obtained their data from Poll Everywhere they can make pictographs and/or bar graphs to show their findings.
This would get the class involved in content questions for all subject areas. I can ask questions and my students can answer. They can also ask questions and make comments. This would get everyone talking about what they are learning!