Carli Lloyd -- Instagram Explodes After Hat Trick ... 100,000 New Followers

Carli Lloyd has become VERY popular after her legendary performance in the World Cup finals last night ... racking up more than 100,000 new Instagram followers in less than 24 hours.

Lloyd was sitting at roughly 226k when Team USA took the field ... but 3 goals later ... and now she's already up to 340k -- not bad.

Similar trend on Twitter -- where she was at 302k during the game ... and now she's at 370k.