Instructor: More than luck is involved in getting a video to go viral. As I've discussed, three elements predict whether or not a video is seen by more than just your friends. First, you need a well-produced, brief video with good audio. Also, focus your video on topics people care about-- what social scientists call emotional resonance-- especially those geared towards young adults and women, as they are more likely to share videos that they like.

And finally, it helps if you can get the attention of a public opinion gatekeeper. It doesn't have to be Jimmy Fallon. But that certainly wouldn't hurt.

Jenna Marbles has over eight million subscribers to her YouTube channel. And she's just an ordinary girl talking about ordinary things. Just imagine the possibilities if your ideas go viral. Thank you.

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OK. I'm glad to take questions if anyone has something to ask. OK. Well, that was a lot to take in. One question I had while researching the topic was whether or not you need a special camera to take good quality video. What I found out was that actually, most smartphones on the market today will shoot great quality video. Yes, [? mirarai. ?]

[? mirarai: what ?] about the sound, though? Isn't that important?

Instructor: Right. [? mirarai ?] is asking whether smartphones can capture audio successfully. And I have to say, it's often difficult. An external or lapel microphone can help make sure that your audio comes through clearly. We probably have time for one more question. Kate.

Kate: You said that it's important to get the attention of-- what did you call them, an opinion gatekeeper? How does someone do that?

Instructor: Right. Kate's asking how to get the attention of an opinion gatekeeper. As I pointed out earlier, television shows like Ellen DeGeneres and Jimmy Fallon have a place for posting fan videos on their websites. That's how some viral videos first get noticed. I have a list of several websites I can share with you after class if you're interested.

Well, that's all the time we have. But let me close by saying what a pleasure it's been. And if there are any other questions, feel free to find me after class. Thank you very much.

[applause]