NEW YORK (AP) — To Mark Zuckerberg, fixing Facebook means many things — protecting users from abuse, preventing elections meddling from malicious actors, weeding out fake news and "making sure time spent on Facebook is well spent."

To critics, it's all that and then some. But many of the steps Facebook has taken so far strike them as insufficient, and in some cases aimed as much at keeping people glued to the service down the line as at really addressing Facebook's underlying problems.

Zuckerberg, who publicly sets himself a "personal challenge" every year, is this year focused on "fixing Face...