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Friends can also visit each others' dragon parks. Every 24 hours a party hat bubble will appear over a maximum of three habitats. Tapping on these will give you DragonCash depending on your park level using this formula:
10 x (Park Level)2
If Game Center is not publishing Friends to DragonVale list, simply power-cycling the device helps.
NOTE: If after the 24-hour period the gems have not replenished (the gift option is greyed out), try restarting the DragonVale application. To do this, simply click the home button twice on the iOS device to show the running applications. Then, hold down on the DragonVale icon until it starts to wiggle and has a red minus sign on it and press to close the application. Finish by re-opening DragonVale from the main application page.
He has also written a blog concerning spotting a hacked park: IDing a Hacked Park