Just jumping in here, but if detecting accidental triggering of irreversible actions is a challenge, maybe the overall approach is problematic. You could, thoug

Just jumping in here, but if detecting accidental triggering of irreversible actions is a challenge, maybe the overall approach is problematic. You could, though, temporarily introduce a confirmation step and see what % of users choose to cancel rather than confirm their invitations or something like that. The chance of a random tap on a face that Facebook (not the user) chose to put on a screen seems to guarantee there will be some accidental invitations no matter what, since accidental taps happen.