Are goldfish social creatures?

I have three goldfish that I got from a store in Chinatown. Everytime I come near the tank, they all come together and swim right up to me and look as if they are begging for food. If I put my finger up to the glass, or if I move to another part of the tank, they follow me. I was at the fish store in Chinatown a... show more I have three goldfish that I got from a store in Chinatown. Everytime I come near the tank, they all come together and swim right up to me and look as if they are begging for food. If I put my finger up to the glass, or if I move to another part of the tank, they follow me. I was at the fish store in Chinatown a little while ago, and every fish there in every tank did that and they would follow me. It's almost like they're saying "Pick Me! Pick Me!" If I tap the glass. they don't swim away, it's like they're not scared of me. When I feed my fish they all gather and I sometimes think they're gonna jump right out of the tank. Any explanations?
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