Forum is great, but we can't post new addresses!
If you can add these two, add them!

Meytal Cohen (popular drumplayer in Youtube)

Meytal Cohen
P.O.Box 461224
Los Angeles, CA 90046
USA

Cobus Potgieter (another drumplayer, popular too)

Cobus Potgieter
P.O Box 19850
Tecoma
5214
South Africa

I know that most of people don't want to send mail to Black, but here it is.

ARK Music Factory
Rebecca Black
16752 Debra Cirl
Huntington Beach, CA 92647
US

Dane Boedigheimer
2658 Griffith Park Blvd. #803
Los Angeles, CA 90039
UNITED STATES OF AMERICA

That's the address for Annoying Orange and Daneboe.