The way this is titled makes the relation seem directional, and in the wrong direction... Basing self worth on social acceptance definitely predates Facebook, and Facebook addiction is a pretty obvious consequence of the positive feedback loop that you'd get form using Facebook to feed that part of yourself. Not defending Facebook or any other social network here, I personally think Facebook is likely toxic -- but I…
in any scientific article, if you reverse the causation in the title and it makes more sense, the author probably made an error. As a wise professor sitting in the audience said to the lecturer: "Normally we put the dependent variable on the Y axis".
Other examples: A reduced reflection of sunlight on the Earth surface causes the surface to become warmer. In places where the surface is covered with ice, a warming surface reduces the reflection. Climate change is caused by an increased amount of carbon dioxide in the air. Climate change is also very likely causing the amount of carbon dioxide to rise further, by releasing methane from methane hydrate on the seafloor, by releasing methane from the arctic tundra soils, and by causing wildfires.
Another example: Poverty causes a lack of access to education. But a reduced access to education also causes poverty.
All these are self-augmenting processes. This kind of feedback loop is also something typical for addiction.