Coin Farm is a unique type of site. They have turned it into a game where you buy birds and they lay eggs, and you cash in the eggs and buy more birds until you have reached the withdraw minimum or you can exchange the withdraw coins for purchase coins and continue building up your birds. The more birds you have the more eggs you yield every hour. They have progressively higher yield birds of course they cost more to purchase. Overall its not a bad site once you get the requirements needed to make the withdraws, at the time of writing this my account is yielding a fairly good amount.  There is one catch to the whole game tho and that is you have to have lots of referrals to be able to withdraw your coins, once you reach that point tho it ends up being a very profitable game. You just have to have referrals as well as build up your birds which makes it a fairly time consuming endeavor unless you deposit some bitcoin to make the purchases needed for building up the account.