Like: Facebook is toxic to your body because it constantly triggers the limbic system. Apparently new pictures on Facebook spur the release of cascades of glucocorticoid. In other words: you're in a state of stress, even though you're feeling good. Or so your S.O tells you when you go to show them a newly uploaded picture of that girl from school who's put on eight stone since A Levels. Come on, that's more exciting than the limbic system, isn't it? EIGHT STONE! Why can't they just join in for one time?