I'm quite not sure if this is the correct place to ask, but it might be. I've installed an iOS application because friend of mine recommended it. That app is called "Meow". After installation I approved basic Facebook permissions. After that, the app asked me to invite other friends.
I clicked "Yes!" and suddenly, some random friend messaged me why have I invited him to the application. I am confused, because I thought that the only way to invite a friend is by Facebook Invite/Request dialog, but I didn't see one.
The notification itself (in Czech, it just says that I've been invited to try the applciation):
Does anybody here have any clue how could this happen? Is that some Black-hat technique?