流行りすぎて緊急回線の帯域まで圧迫してたので、ちょっと問題になりました。
今で言うLINEの送り合いみたいなかんじですかねー。

It got so overwhelmingly popular that it was even putting pressure on the emergency circuits, so it became a bit of problem. In current terms, it'd be something like sending LINE messages to one another.