DevLearn: Ze Frank Keynote - Level of Engagement

Just saw an entertaining keynote at DevLearn by Ze Frank (www.zefrank.com). He creates social media spaces with the intent of entertaining and engaging his audience. One of the things that struck me was that he sees the same 1% rule across a very large audience but believes that there are many levels of audience engagement. And challenges us to find something to satisfy users (learners) who are:

• passive
• active
• interactive

But later during Q&A, he talked about how he thinks through the challenge and he really tries ways to allow initial engagement in "one click." What can you do to begin to engage your audience with one click? A rating? A vote?