Besides these positive points internet has some negative point which can not be neglected just like, if we use internet in excess we become addict of it that's may be harmful to our health, children may use some inappropriate website so there may be some negative impact on their little mind.
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If you want to go Surfing dont ask this question but some disadvantages are marine life such as sharks, drowning, sharp coral, fish, injuries, belly rashes, sore arms and more. But remember the question was about DISADVANTAGES, and id rather consider the glass half full than half empty. Hope this helps