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.

Chuck you farly

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.

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