Emo is a social movement entirely ripped off from other social movements that came before.
Some would argue better movements, because it could at least be claimed it hadn't been done before or was an improvement upon established social movements.
Goth: Already did the dark clothing, makeup, hair, chains, jewelry, sad, poetic, down beat, quirky, artistic, (You get my drift)...
Punk: Edgy, angst, angry, political, emotional, DIY, anti-establishment, hard, loud, aggressive,
Mod: Tight clothing, jeans, shirts, sneakers, haircuts, upbeat, fast, angst ridden,
New Wave: The Flock of Seagulls haircut, black and white striped clothing, dark, angst, unrequited love, pop, emotional