ios rewards sharing?

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does anyone else have issues trying to share or receive rewards using iphone? when i try to to share rewards it opens facebook and then goes back to game and reloads it all and i lose that screen, and im pretty sure allies have tried to share rewards with me but I cant seem to get it to work.

is there some simple instruction I am messing up?

for some reason having FB app open while i play app seems to slow it down which makes it less enjoyable.

Thanks,

PJ