Mike or Heather?

Hello, our names are Jake and Zack, and we would like to play a game. This game is called "Mike or Heather?" You see, we have these two friends, Mike and Heather, and they are both pretty feminine. And yes, Mike is a boy, and Heather is a girl. But I bet you couldn't guess who is who just by viewing their tumblr pages. So that is our game. Let's see how good you are.