No More Doom and Gloom
This may be controversial, but I'm not sure I agree with the doom and gloom part of the premise: "After all, it is no longer easy for citizens to identify credible information, engage in legitimate debate, or counter disinformation."
It's NEVER been easy to do these things, and now I think it's just more exhausting. Information (true or false) spreads faster, and the speed exacerbates what has always been a challenge into a phenomenon we're calling fake news. The tip of an iceberg.
For the librarians:
Q1: Trace information source. Pool collective wisdom (see what other viable sources are saying).
Q2: Purchase credible sources for collection; feature sources in programs, displays.
Q3: The librarian is a vetting agent of facts and sources, and aims to provide all points of view, as well as a place and opportunity for those points of view to convene.