To me the biggest concern or limitation of knowledge sharing via SM would be 'false/fake/untrue' knowledge. Hence knowledge would have to be validated before sharing or it could have chaotic consequences.
First, we must have a system where Information must be validated, contextualized and organized. The second step is to respect the authors' privacy, giving the necessary credit for the production of knowledge. Finally, the sharing of internal knowledge must be enhanced and encouraged by senior management.
The social platforms for sharing ideas or group discussions use new technologies. By themselves they really are not adding knowledge but we can only call these as ICT tools. Now these tools have different purposes- as an example-digital workplace separates work from place, while COP joins professionals from same field (say accountants) while say ESN create profiles. The drawbacks are many however to me the critical issues being 1) Content ownership (if top management does not approve) 2) Structures too rigid or hard to use apps often show that employees are reluctant to use or share over them. 3) the level of trust of moving communication in social situation 4) I also noticed that many companies and even academic institutes policies prevent employees from sharing work-related experiences on public social networking sites which reduces drastically the primary objective of knowledge share.
There are lots of dynamics involved in knowledge sharing among organisational staff. I have explored this issue in depth on my dissertation and
Kwayu, S., Abubakre, M. and Lal, B., 2021. The influence of informal social media practices on knowledge sharing and work processes within organisations. International Journal of Information Management, 58, p.102280.
There is no clear-cut answer to your question it depends on situation and context involved