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A sneaky behind-the-scenes jerk who talks for both sides so they never realize they're getting messed with.
My mom and dad have been arguing for 20 years. The facilagator is probably laughing in the shadows.
My boss said I did great, but the facilagator made him say that so I'd never know I got shafted.
My ex and I broke up. The facilagator made us both think we were the one who got dumped.