What are the downsides of SNS?

Could you elaborate on the potential drawbacks or downsides of utilizing Social Networking Sites (SNS)? Are there any risks associated with sharing personal information, privacy concerns, or potential impacts on mental well-being that users should be aware of? Additionally, how might SNS contribute to social isolation despite facilitating connections, and are there any negative effects on productivity or time management? It would be insightful to understand the multifaceted aspects of SNS and their potential pitfalls.