In contrast with most of the comments, I strongly support this change. Social media has been a tool for radicalization, and this is a potential solution worth trying. Will simply informing people that they're drifting beyond the Overton window could put a damper on the radicalization? I don't know, but I certainly hope so.
>>alumin+(OP)
"Wow, the overarching Orwellian corporation Facebook thinks my views are getting a little too far from what's accepted by the mainstream. Better get myself back in line like a good citizen!"
Yeah, I'm thinking it can only produce further radicalization.
>>alumin+(OP)
Your mistake is viewing "radicalization" as being driven purely by changes in communications media, as opposed to underlying socioeconomic and political developments which have been negative for the overwhelming majority of society. This isn't going to be handwaved away with Facebook dialog boxes.
>>alumin+(OP)
Explicitly exposing ever-changing conceptions of acceptable ideas by the site seems like a good way to lose dissatisfied users who give up trying to improve discussion.
Maybe that achieves the same thing in a simpler way than changing minds. But does shrinking the userbase please advertisers?