Asking for help in Pig events

It seems like you can only truly do this 1-2 times a day. Also, is there a method to receiving invites for help from people around the world? It seems more likely to happen when you're on the event screen from what I've seen. Also, do you guys play with a lot of FB friends? I've got like 500 RL friends and family and only 1 other person plays ABF. This seems to put me at a disadvantage when it comes to pig fights. Is there a way to add non-FB friends at all?
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