How to find kids to troll on Minecraft PC?

So I'm bored and saw some people trolling kids on Minecraft on the 360 and PS3, and I want in on the action. Thing is, I only have Minecraft on PC, but I saw a couple people trolling older people on Minecraft PC, so I wonder how to troll kids on PC? How do I find kids on Minecraft PC to troll? How do I get voice chat working? How can the I troll the kids on his/her OWN server? Thanks!

Added (1). Just to clarify, I saw the people trolling them on Youtube.

Guest

Chuck you farly

John B

If you're getting bored of Minecraft, FIND SOMETHING BETTER TO DO! Get out, make friends, party hard, just do something more rewarding with your life than finding diamonds and ******* with people for no reason!

Or just spam, "KILL YOURSELF PHAGGOT!" in the chat as much as you can.

Kyle

You stick fire into your computer and a trollgps will appear telling you where to find kids

Billy