Yes, and also consider the relationship between knowing an answer, being confident in your knowledge, and having the time to explain details or find sources.
People (who are intellectually honest) say "I don't know" when a question is specifically addressed to them, and so they feel a responsibility to give an answer. They don't respond at all when they don't know the answer and they haven't been addressed... except if they are motivated by curiosity and wish to indicate that they, too, are interested in the answer.
Incidentally, the mistake of assuming that everything on the Net is addressed to you is a common failing among people who have little experience. It happens on Facebook all the time...
People (who are intellectually honest) say "I don't know" when a question is specifically addressed to them, and so they feel a responsibility to give an answer. They don't respond at all when they don't know the answer and they haven't been addressed... except if they are motivated by curiosity and wish to indicate that they, too, are interested in the answer.
Incidentally, the mistake of assuming that everything on the Net is addressed to you is a common failing among people who have little experience. It happens on Facebook all the time...