These were the first real money games allowed on Facebook and mixed bingo and slots with cute furry animals. Essentially, they were parts of Jackpot Joy. In order to play on Facebook, you had to use an existing Jackpot Joy login or set up a new account with them – Facebook account credentials did not give access to the app as age and country verification were required – and a deposit was also needed prior to playing. The Friendzy games were also available at the main Jackpot Joy site which often had a better sign-up offer, so it’s hard to see why anyone would want to play them on Facebook instead. Indeed not many did and the app closed down in May 2014.
There’s still a (very popular) version of not-for-real-money Jackpot Joy slots which you can play on Facebook.