I think it is an interesting idea but, I have mixed feelings about it.
On one hand, it's nice to be exposed to other people's knowledge, that part is nice. On the other hand, it is quite possible that someone may talk about a subject at a level which is way beyond my, and the average individual's, knowledge on the subject. Not being able to understand could be a bit frustrating.
Normally, if I need more information about some subject, Google is there to locate useful things for me and, among them, I can pick those that are at the level I can understand and go forward from there.