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>It can also help us buy things we didn't know we needed

It is remarkably difficult for such a thing to happen. Very little is needed and that that is tends to be rather obvious.

In Maslov's model the volume of needs would probably graph to an ellipse instead of a triangle.

https://en.wikipedia.org/wiki/Maslow's_hierarchy_of_needs

I think there's a clear distinction to make between clicking on links to other people's content - that's like walking into a store and the proprietor sharing his video footage of you in there with other vendors - vs. having your own personal expression (photos, personal sentiments, friend networks) shared without your consent.

> It can also help us buy things we didn't know we needed, bringing our unconscious forward and making us realise things about ourselves we didn't know

There is no commercial incentive to do any of that

Most commercial incentive I have witnessed is to do precisely that.