One way to interact with students in a class is to ask then to vote on an issue or something you have been discussing in the lesson. Polls Everywhere is a website which enables you to get immeduate feedback in the form of charts as people respond by texting or on the internet. This can be displayed in the lesson and so form the basis of the continuing discussion. Alternatively, the poll can be added to a website or downloaded in a PowerPoint or Spreadsheet file. As long as you want a maximum of 30 responses, the service is free but you can pay varying amounts for additional features and votes.