> In fact, in general, in any non one-on-one conversation the answer "I don't know" is not useful because if you don't know in a group, your silence indicates that.
Only a response makes it clear one has read and acknowledged the question and sometimes there are people expected to know, if they don‘t the should say so.
Only a response makes it clear one has read and acknowledged the question and sometimes there are people expected to know, if they don‘t the should say so.