John Boyer, a Virginia Tech instructor who teaches a supersized world geography intro course (2,760 students) with 2 TAs - uses social media to maintain high personal touch with the students and to attract world-famous guest instructores (e.g., Nobel Peace Prize laureate Aung San Suu Kyi).
Who doesn't want instant feedback? With Poll Everywhere you can instantly find out where your students are stuck, what they enjoyed, or where they want to go tomorrow. The great thing is you don't have to purchase expensive clicker equipment just utilize the technology they already have with them.
Using this website you can poll your students about politics, current events or even quiz them on the fly through sms text messages, twitter, or the web.