> There have also been a lot of efforts at Facebook to show you content that would lead you to have more positive interactions, like posting similar things yourself rather than be a passive spectator.

The other examples are decent (if you explicitly opt-in, not just mindlessly click a checkbox), but that Facebook one...seriously? It is extremely disappointing to see someone use that as an example of "good manipulation" on a site like this non-sarcastically. How could it be good for a corporation to hire psychologists to manipulate customers into spending more time on their product? Especially a product that is known to negatively affect mental health. It's hardly any different from Joe Camel trying to push kids to smoke.