Final answer:
The nurse manager should explain that posting client information on social media can break confidentiality even without names, and highlight the importance of respecting privacy.
Step-by-step explanation:
The nurse manager should inform the nurse that even without mentioning the client's name, sharing information about a client on social media can still potentially violate client privacy and confidentiality. It is possible for individuals to piece together information, particularly in small communities or where the situation might be recognizable, leading to identification of the client.
The most appropriate response would be to educate the nurse about the importance of maintaining confidentiality in all forms and remind them of the professional and legal implications of breaching patient privacy.