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I don't think the dramatic rise in online dating matches to a corresponding dramatic change in our economic system? If you consider Huxley's Brave New World, "hook up culture" was the dominant system (for the Alphas) even under a totalitarian state planned economy.
In fact, if you look at Marx's actual words on the subject below, Capitalism is actually playing a leveling role in dating: that you can supplement your personal deficiencies with your income, something which will be removed under socialism:
Assume man to be man and his relationship to the world to be a human one: then you can exchange love only for love, trust for trust, etc. If you want to enjoy art, you must be an artistically cultivated person; if you want to exercise influence over other people, you must be a person with a stimulating and encouraging effect on other people. Every one of your relations to man and to nature must be a specific expression, corresponding to the object of your will, of your real individual life. If you love without evoking love in return – that is, if your loving as loving does not produce reciprocal love; if through a living expression of yourself as a loving person you do not make yourself a beloved one, then your love is impotent – a misfortune.