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Hey Georgeta,
It might be to do with the fact that Facebook has made some changes to their privacy policies and it's had an effect on the friends in game.
All you need to do is go to settings and make sure to allow Pet Rescue to have access to your friend list.
Don't be surprised if your friends don't come up straight away after you've done it, your friends need to do the same and you will become visible to each other!