where are the gem codes?

hello! i am relatively new here and i wanted to as about a couple of things i dont understand hopefully someone is willing to help:

1) i want to know where to get the free facebook gem codes as it is not possible for me to keep buying gems all the time

2) i want to know how to form a group to get the group bonus

3)in regards to digging the post explaining the digging probability of digging anything useful is deleted and i would really appreciate it

4) i would like to know if there is anyway to exchange coins for gems

5)i would like to know more about zoe's auctions like if we can post an action and if bids are in gems only and so on

i am thankful for any helpful comments 


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