This is honestly one of the more concerning things Meta has come out with in years.
Social media giants have long since moved on from being the go-to companies for information about the public, and are now (with the help of "AI") moving solidly into the realm of injecting ideas into the public. Consider the implications of even 10% of the general public having regular conversations with their MetaFriend. They talk about their hobbies, their needs and wants, and all that data is obviously being collected, but these people have also handed Meta the ability to propose new ideas and change their viewpoint. Their "friend" is now in a position to drag them unknowingly into any political position Meta wants, and they can do this at scale.
That's enough to change public sentiment on nearly every issue. It's enough to sway elections.