"feel fatigue because of too much using of SNS" is "SNS 피로증후군"(e-sŭ-aen-e-sŭ pi-ro-jŭng-hu-gun) in Korean.
When literally to "SNS fatigue syndrome". Users of SNS (social networking service) are being addict on SNS. SNS is the center of their life, they cannot separate it from them.