With the version 1.0 social update, you should be able to see a friends icon at the bottom left of the screen. Click on that. You should be able to see your list of friends. Click on their name, then click visit. You can play "tag" with their Zombies(to earn XPs) and also give them gifts. If you do not have friends, click "Find Neighbours" and add friends!! Have fun! ^^
Attack other farms.
yes
Nothing
To get that farm banner on Zombie Farm, you've got to win an invasion and have some luck with the loot you get.
You cant. Thats in Plants vs. zombies, not zombie farm.
you cant .....
You buy it from the store.
shot it with an arrow
Combine flower zombie with flower zombie.
surround the zombie with plants
you get a zombutterfly
That is when you harvest a zombie that is dead