Be funny, and if you can be academically funny like the University of Pennsylvania, be that, too. But test out your humor on a small group of varying subjects to ensure it it funny, because humor is very subjective.
Never look at a piece of content, or an app, or any project, and say, "Oh, I like this," and think that you've accomplished what you set out to do. It's not about you, but your audience. Help them like your content.