kates's ruby plurk lib is a nice plurk lib for ruby. But I notice that the 'add_all_as_friends' method doesn't work and always throws an exception (API call return an error message page and JSON parse failed)
Add following code before you new a Plurk::Client
This is because that the API path is /API/Alerts/addAllAsFriend*s* not /API/Alerts/addAllAsFriend. The code shows that they amiss lost the ending 's'. And I will contact them to fix this.